copies planning_elments#show to work_packages#show
correct wrong specification description
copies issue#show view to render work_packages
lets work_packages_controller be less planning_element specific
provides implementations for journals and controllers
removes unneeded code
shows ancestors on work_packages#show
enables showing work_packages history by copying the partial over from issues

Will need to be cleaned up as it is currently very issue specific
Display kind of work package
Show issue and planning element attributes
Move to_s to work package
Fix progress bar format
Show start/end date for PEs
Show work package hierarchy
Adapt issue hierarchy style
Add localization for work package hierarchy
Link to work packages that are not issues
Move relations to work package
Set work package relation routes and permissions
Show work package relations