collect: bugfix to not symlink yourself

* Removing the destination folder from the list of folder to read from.
  The destination folder is also the application static_folder so it be
  unset before running the collect operation. (fixes #244)

* Ignoring the existing files in the output log of the command and
  showing only the one added, with a nice counter at the end.

Signed-off-by: Yoan Blanc <yoan.blanc@cern.ch>
Reported-by: Jan Åge Lavik <jan.age.lavik@cern.ch>
workflows: initial user UI integration

* Kickstarts the user UI integration of Holding Pen by adding
  a new menu item "Your Pending Actions" to the user UI and new
  settings pages.

* Refactors the initial index page of Holding Pen to more nicely show
  pending actions and button to take users to the Holding Pen.

Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
workflows: definition fetching improvements

* Improves the procedure of getting workflow definition objects
  to be compatible with older workflows that may not exist
  anymore and at the same time be more forgiving.

* Fixes some documentation typos.

Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
workflows: widget->action name change

* NOTE Changes the naming of Holding Pen "widgets" to "actions" to
  more clearly distinguish these UI elements from widgets elsewhere
  in Invenio. The name "action" better suits these types of UI
  components.

* Renames several files to make use of this new naming strategy.

Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
workflows: user session in Holding Pen

* Changes the way the Holding Pen is storing info about the
  current session by using the user session.

Signed-off-by: Jan Aage Lavik <jan.age.lavik@cern.ch>