Let issues work via STI (deletion does not work)
Show PE edit dialog
Restore deleted file
Rename name field
Remove superfluous file
Remove statements present in WorkUnit
Add work unit dependency
Remove acts_as_tree
Use work unit instead of issue
Use work unit to get time entry
Remove timestamp compatibility file
Adapt tests to changed naming
Fix routing test
Fix change column naming
Do not delete already marked PEs
Fix missing element error
Fix cuces
Adapt fixtures to changed database schema+
Adapt tests to changed object layout
Handle different change column names