collect: addition of sorting filter

Signed-off-by: Javier Martin Montull <javier.martin.montull@cern.ch>
uploader: initial manage command implementation

* Adds basic `inveniomanage uplaoder insert -f FILE` command.
  (addresses #1772)

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
sqlalchemy: fix mysql index creation

* Fixes checking of Text type supporting the case of NullType
  column type.

Signed-off-by: Leonardo Rossi <leonardo.r@cern.ch>
groups: port missing functionality

* Adds implementation of user group manage function.

* Adds filter on list of group that user can join.
  (closes #1788)

Signed-off-by: Leonardo Rossi <leonardo.r@cern.ch>