This reverts commit 818bc0f5.

- setIdGenerator by node for several modules
- handle invalids includes data analysis

- TODO: use the new custom dialog gadget

- metadata is stored as JSON
- data operation leads with metadata of each type of files
- minor fix: setting title in data streams

- now it uses small chunks to: read Data Stream content; write raw data file; read raw data arrays; save raw array
- framework to handle processing data of more extensions

- SR with git versions: https://lab.nexedi.com/rporchetto/telecom/raw/WendelinIA-Telecom/software_release/software.cfg

- ebulk tool last release in data stream
- outdated dataset reference check removed

- tool new name 'ebulk': both windows and unix scripts updated
- handling of interrupted split ingestions (check reference and delete old pending ingestions)

- new local role 'admin' with permission to delete (contributor and less can't)
- minor changes in external methods
- bug fixing if dataset ref has invalid chars
- bug fixing when checkin ingestion existence
- handling possible exception if duplicate ingestions

- new about us gadget (empty for now)
- new title
- command description more clear
- bug fixing of missing parameter when rendering form gadget