Eng TPR Min and Max derived parameters.
Simplified can_operate.
Added Eng TPR KPVs after realising it is different from EPR
Added support for attributes in can_operate methods.
Changed V2Lookup to use new can_operate attributes.
Added tests for Engine TPR KPVs.
Re-introduced improved Flap after a conflict resolution accident
Merge branch 'master' of https://github.com/FlightDataServices/FlightDataAnalyzer
Simplified Flap can_operate
Re-enabled commented imports in multistate_parameters.py
Updated and fixed tests.