- changes in form rendering, like hide modification date, don't affect storage replication (like forms 'AsJioView' do)
- each officejs app will have its own view actions, allowing to share portal types

- still missing to hide modification_date on document view

- add element gadget removed, combined into create document

- todo: get form definition from a create doc action

- new approach uses a new ojs jio gadget
- old one is kept for backward compatibility (not migrated apps)

- new approach uses a new controller gadget
- old one is kept for backward compatibility (not migrated apps)

For example, if property_sheet "prop" was moved from BT 1 to BT 2 and BT 1 doesn't exist anymore.

Before this commit we have this order:
1.  install BT 2 ("prop" exist and isn't touched)
2. remove BT 1 ("prop" is removed)
=> at the end "prop" doesn't exist anymore

After this commit we have this order:
1. remove BT 1 ("prop" is removed)
2. install BT 2 ("prop" is readded)
=> at the end "prop" exists and is OK

/reviewed-on nexedi/erp5!866