Actions that modifies a document should return the new document version

When an action modifies a document, it changes its revision. We should return this revision directly instead of letting the client ask the revision to the server: by doing it, we avoid potential inconsistencies in the revision obtained in the client.

Here's the list of actions which should return a revision in case of success in AJAX request:

• SaveAction / SaveAndContinueAction
• UploadAction / DeleteAttachmentAction
• CommentAddAction / CommentSaveAction
• ObjectAddAction / ObjectRemoveAction
• RollbackAction
• PropAddAction / PropDeleteAction / PropUpdateAction