fix torque converter: if speed limit is defined for a tc gear, usee this speed limit when searching for TC operating point

ading new PIF files in testdata due to changed payload calculation (previous PIF do not match loading)

rename k_vehline to k_engLine
introduce k_vehline calculated from P_wheel_in

set efficiency for AT transmissions to 0.925. add parameter for gearbox type to method for creating loss-map

completed bus: throw exception if the tmplm is too low for the number of reg passengers

Merge pull request #19 in VECTO/vecto-dev from VECTO/mq_vecto-dev:feature/VECTO-1265-new-acceleration-curve-for-buses to develop

* commit '32bf3e5e':
  fix testcase.
  adding new acceleration / deceleration curve for buses