tempfile templates now contain the process id in order to avoid (rare)
race conditions
Merge remote-tracking branch 'origin/develop' into develop
Merge branch 'release/0.12' into develop
Remove hardcoded and unused workflow list from SC::CheckPrereqs activity
Replace missing workflow classes with an empty stub class

When loading workflow definitions from former version where classes
have been deleted the factory chokes as it can not load them. As they
are not needed for display purposes, we pass an empty stub
Silently skip Metadata when no subject style is given.

Enrollment workflow triggers the activity but might not have
a subject style set which results in a workflow crash.