Fixes #140 import sac members
Fixes #331 No exact title text cuting after 50 Chars
refs #331; adapted text truncation on the tooltip for tours on the
calendar
closes #331; merged development branch into integration
Fixes #131 Tour hints added
Fixes #345 manage tours for tourleaders by tourchief
Fixes #353 tour participations search enhancement
Fixes #245 tour group colours in calender
Merge tag 'v1.8.3' into integration

Tagging v1.8.3; some small bug fixes
Fixes #346 adjacent tours and appointments
Fixes #356 some inactive fields in edit mode
Fixes #185 change tourguide action
Fixes #76 tour reports integration
Fixes #357 view birthdate in tour participation
Fixes #76 fixes small bug by edit tour_report
fixes #356; merged development branch into integration
refs #357; removed an unnecessary if statement
fixes #357; merged development branch into integration
Merge branch '357_view_birthdate_in_tour_participation' into integration
refs #353; refactored the three separate queries into one query and moved
the business logic into the model
fixes #353; merged development branch into integration