Add Operations from nuxeo-labs

nuxeo-labs contains some operations very frequently used, which would be great to have in the platform.
Plug-in source is available on github (well. of course).
After checking with the team, here are the main operations:

"Must Have"

• Copy Schema
• Reset Schema
  These two one are used about every time, at least when we want to propagate metadata (so a "Case" folders doc. type with is "case" schema is duplicated in the children, so we can query on pictures based on the case metadata for example)
• Document > Add Facet
  Dynamically adding a facet is quite useful
• Document > Get Tags
  This one is more because we have operations to add/remove tags, none to get them
• Document Exists
  A simple wrapper to a CoreSession API, but very, very useful. Repository.GetDocument throws an error if the document does not exist. Catching this error is not enough, the transaction is already marked for roll-back, while we just want to know if a document exists or not.
  Notice it would require a little change to make it cool inside a chain (the operation, as it is, returns a boolean)
• Services > Vocabulary: Add Entry
  There already is an operation (not in Studio), but it is complex to use, requires JSON, etc. here we have useful parameters

"Could Have"

• Document.GetLastVersion
• Document > Add Complex Property From Json String
• Notification > AdvancedSendEmai
• User Interface > Navigate To Url

"Conflict with Existing"
HTTP Call and HTTP DownloadFile: We have something similar with the HTTP automation helper, but the later is a bit harder to use, less easy and straightforward.