workflows: new stage for halted

* Adds 'WAITING' stage for halted workflows with
  no action added to them.

Reviewed-by: Jiri Kuncar <jiri.kuncar@cern.ch>
Reviewed-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
Signed-off-by: Georgios Papoutsakis <georgios.papoutsakis@cern.ch>
workflows: new stage for error

* Adds new stage for objects that encountered an error.

Reviewed-by: Jiri Kuncar <jiri.kuncar@cern.ch>
Reviewed-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
Signed-off-by: Georgios Papoutsakis <georgios.papoutsakis@cern.ch>
workflows: detailed workflow task list

* Displays workflow definition and completed tasks in details page.

* Task names to display are chosen from the description attributes
  of the task, if not present from the first line of the docstring,
  if still not present, the function name is finally used.

* Wraps to tasks to get their attributes from outer function.

* Adapts testsuite to new workflow stages.

Reviewed-by: Jiri Kuncar <jiri.kuncar@cern.ch>
Reviewed-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
Signed-off-by: Georgios Papoutsakis <georgios.papoutsakis@cern.ch>
oaiharvester: decorating inner function in task closure

* Wraps workflow tasks to get outer function's attributes.

Reviewed-by: Jiri Kuncar <jiri.kuncar@cern.ch>
Reviewed-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
Signed-off-by: Georgios Papoutsakis <georgios.papoutsakis@cern.ch>
deposit: decorating inner function in task closure

* Wraps workflow tasks to get outer function's attributes.

Reviewed-by: Jiri Kuncar <jiri.kuncar@cern.ch>
Reviewed-by: Jan Aage Lavik <jan.age.lavik@cern.ch>
Signed-off-by: Georgios Papoutsakis <georgios.papoutsakis@cern.ch>
workflows: translation suuport

* Adds translation support for all templates.

Reviewed-by: Jiri Kuncar <jiri.kuncar@cern.ch>
Signed-off-by: Georgios Papoutsakis <georgios.papoutsakis@cern.ch>
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