Feature #2815 & #3146 : adding transverse file filter
- adding a new cache service : cache associated to the current thread
- adding new common annotations in order to specify service methods
- adding tools to work on annotations
- adding a new PasteDetail extension around primary keys (from / to)
- adding the possibility to communicate dummy files in order  to take them in account in process management checks
- adding annotation associated to an engine that handles simulation action process checks on services
- adding dummy handled file Attachment (SimpleDocument) converter
- adding dummy handled file Thumbnail converter
- centralizing the getting of the MaximumFileSize parameter value
- fixing some little problems around the data storage quota (in back-office)
- handling document import
- migrating ThumbnailService to Spring context
- refactoring some code