Store a jio_configuration string in ERP5 Persons to share contact info,
remove the entire concept of folders and replace it with rooms instead,
use emails to find contacts, replace ERP5 Python Scripts with pure jIO,
move query helpers to gadget_global and force names to be alphanumeric.

Make WebRTC gadget spawn a new hidden div inside the chat panel
instead of indefinitely expanding downwards, highlight current room,
remove automatic login and authentication, add field for hateoas URL,
move all utility functions such as logError into gadget_global.js,
add hasOwnProperty, send join/quit notifications in bundles once more,
fix cannot-make-second-connection bug by resetting host candidate,
change declareService to submit onEvent, split submit buttons among
separate forms, and declare chat panel functions as gadget methods.

Add font, remove unused JIO Mapping Storage,
split chat box into contacts and chats tabs,
only send join and leave notifications to others,
add message colours, change styles with favicons,
declare new WebRTC gadgets for every room connection,
create new room with their own names for each client,
manage more query values in parent gadget with less code,
generate Dropbox link to stuff URL queries as state info,
prepare parseParams to handle new connections from the panel,
strip whitespaces, delete "my_", remove line breaks with CSS,
understand how queues in .ready() block .declareService() forever,
and finally, use flexbox CSS to completely overhaul look and feel.

Instead of having chat_panel as a subgadget of chat_webrtc,
both chat_panel and chat_webrtc are direct subgadgets of chat.
Strip out all chat-related functions and variables from chat_webrtc,
so that it can be used for non-chat-related purposes in the future.
Bundle state variables into dictionaries for cross-gadget passing.
Completely rewrite HTML structure to reflect a linear hierarchy.
Fully document and augment existing URL query parameters.
Replace all var declarations with let or const from ES6.
Modify chat panel message_list and last_message_dict
to prepare for multi-room messaging, coming soon.

Allow users to configure storage synchronization options during login,
with the choice of ERP5, Dropbox, WebDAV, or no remote storage.
Remove gadget_erp5_chat_login by merging it with the main page.
Use mapping storage and remove peer_source from messages.

Store all chats as Text Posts using ERP5 in a replicate storage.
Synchronize divergent chats through a three-step process:
1. send doubler (request a request from the host)
   receive request (get dict of host's last-seen messages)
2. send archive (give all new messages to the host)
   receive doubler (get after host is fully updated)
3. send request (give dict of your last-seen messages)
   receive archive (get all new messages from all peers)

This means that Space Chat now synchronizes correctly even when
peers disconnect from each other, and all chat messages will
eventually be stored on ERP5 as soon as one peer reconnects.

Co-opt Webrtc Rooms module to directly store negotiations as attributes,
integrate Space Chat with ERP5 and pass parameters through the URL,
move Dropbox main login page, and make authentication more robust.

Abstract WebRTC signalling to prepare for ERP5,
detect client browser unloading and send message,
directly display URLs of images as an actual <img>,
add global "notifications" such as joining and /help,
clean names to avoid OAuth2 state conflicts in the URL,
make Dropbox authentication more robust against failures,
and parse non-image URLs as <a> using a regular expression.

Add initial files for space chat project. Features include:
- Real-time text-based communication system over WebRTC
- Modular chat separation into 'folders' and 'rooms'
- Multiple signalling options, including text or Dropbox
- Configurable local storages like IndexedDB using jIO
- Follows WebRTC best practices by using adapter.js shim
- Adjustable polling behaviour for managing Dropbox offers
- Powerful offline synchronization algorithms within rooms

Actually none of the above are even features, this chat is very bad.

The file list is:
- adapter.js: shim for cross-browser WebRTC compatibility
- fast_priority_queue.js: by adamhooper, for sorting messages
- gadget_erp5_chat: main chat gadget, contains local storage and login
- gadget_erp5_chat_login: gadget to get name, folder, and room from user
- gadget_erp5_chat_webrtc: WebRTC signalling gadget to open communications
- gadget_erp5_chat_panel: actual chat gadget, has all the chatting functions

MonthlyRangeMovementGroup: make tested property list configurable, whose default is ('start_date', 'stop_date').

Fix inconsistencies from gadgets

/cc @jerome 

/reviewed-on !225

erp5_knowledge_pad: Fix inconsistency with preferred_height and preferred_width in google_maps gadget

ERP5Type.ConsistencyMessage for PropertyTypeValidity type_check on portal_gadgets/google_maps (message: Attribute preferred_width should be of type string but is of type <type 'int'>)
ERP5Type.ConsistencyMessage for PropertyTypeValidity type_check on portal_gadgets/google_maps (message: Attribute preferred_height should be of type string but is of type <type 'int'>)

erp5_knowledge_pad: Fix inconsistency with preferred_height and preferred_width in google_calendar gadget

ERP5Type.ConsistencyMessage for PropertyTypeValidity type_check on portal_gadgets/google_calendar (message: Attribute preferred_width should be of type string but is of type <type 'int'>)
ERP5Type.ConsistencyMessage for PropertyTypeValidity type_check on portal_gadgets/google_calendar (message: Attribute preferred_height should be of type string but is of type <type 'int'>)

erp5_knowledge_pad: Fix inconsistency with preferred_height and preferred_width in google_search gadget

ERP5Type.ConsistencyMessage for PropertyTypeValidity type_check on portal_gadgets/google_search (message: Attribute preferred_width should be of type string but is of type <type 'int'>)
ERP5Type.ConsistencyMessage for PropertyTypeValidity type_check on portal_gadgets/google_search (message: Attribute preferred_height should be of type string but is of type <type 'int'>)

ERP5Type.ConsistencyMessage for PropertyTypeValidity type_check on portal_gadgets/clock (message: Attribute preferred_width should be of type string but is of type <type 'int'>)
ERP5Type.ConsistencyMessage for PropertyTypeValidity type_check on portal_gadgets/clock (message: Attribute preferred_height should be of type string but is of type <type 'int'>)

erp5_payroll_l10n_fr: reflects change in entreprise/employer from paysheets into the dialog aggregating paysheets for DSN social reports

/reviewed-on nexedi/erp5!229

erp5_calendar: Leave Request Period only use services as Resource

erp5_travel_expense: In expense report, remove useless rsvp.queue, do not overwrite special character

synchronize automatically data block web site

A Localisation Record is created when submit a expense record
only one received localisation record per user

erp5_travel_expense: localisation search should not prevent image preview

erp5_travel_expense: make sure localisation gadget is loaded

erp5_travel_expense: don't create localisation record when location is undefined

erp5_travel_expense: naming convention

erp5_travel_expense: Have Projects availables in Expense, define group on images and set source_section