Follow up on shift exchanges, shift market and few others
- refactor code names (unified function names)
- added few Urls/views (shift/ shiftForMarket/ ShiftExchange)
- calendar js fix (to include new data source
- new notification on ShiftForMarket
- various little ones
as usual, this can be tested in: https://shifter-lab-01.cslab.esss.lu.se/ (attention - different users/passwords)