make the default json view compress output
add action to return projects managed by current user
add timecard model function to return bookings for managed projects
convert timecard controller to use context switching
add timecard action to get member bookings for projects
modify projectChooser to support custom data sources
add frontend model functions for the managed projects and project bookings
add team statistics to the frontend
fix small style issue in the monthtable
add primary key to the project_manager_relation

we need this to be able to edit it easier later
fix error controller to select the appropriate view script
remove legacy timecard frontend code

this code did not work anyway and broke the legacy frontend
remove legacy json converter

somehow this breaks the legacy frontend, we now just send normal json and
everything works again
fix workbalancedbyday

just export data for the current user, not all users
fix team statistics table layout
attach to the exoprt button for export
team statistics export
don't replace the wohle node in projectbookingstable
remove excluded history tests and cleanup phpunit.xml
remove/repair skipped/incomplete/pointless tests