0424: fix incorrect fill level pct
#385
0425: fix street speed change
#384
0426: mode2: preliminary support for unloading attached choppers
only Poettinger Mex 6 and Mex OK supported for now
0427: mode2: support for unloading AutoTractor attached combines
(only tested with attached choppers for now)
0428: add optional worker wage cost
* activatable in courseplay.xml ("courseplayWages")
* default wage: 666 per hour (difficult), 499.5 (medium), 333 (easy)
0429: field edge: more accuracy, smoother path in curves
courtesy of fck54
closes #375
Merge branch 'master' of https://github.com/Courseplay/courseplay