Add VALUE transformation trello

Fix typo in config.json

Fix custom config loading

FIX: properly count dataset at the end of the upload

BUGFIX: use search api for scheme autocompletion

Admin ergonomics review

Trello card

code consolidation

• refactor selector to have local and global version
• remove selector using state from several reducer
• move front in public directory
• isolate admin

Format on fields: Trello card

Contributions on resource: Trello card

Fix LINK faill if one of the reference value is null
see trello#89