added options for adaptive slicing
created stump of the AdaptiveSlicing class that will provide the cusp computations
added min and max_layer_height options to extruder to be used as limits for adaptive layer heights
Make tooltip for toolchange_gcode more precise
implemented core adaptive slicing algorithm
added basic test cases for adaptive slicing algorithm
Ported more things to XS
Removed debugging line
Bugfix: reprocess brim and skirt after changing number of copies
Merge branch 'master' of github.com:alexrj/Slic3r
Fix failing tests
Bugfix: changes in extruder count in GUI were not propagating to the rest of the GUI
Bugfix: configuration wizard was broken. #2210
Bugfix: fix crash in some circumstances caused by Avoid crossing perimeters. #2271
Typo in command line help (wrong default for default_acceleration). #2283
Bugfix: because of a typo, bridge acceleration wasn't applied anymore. #2296
Bugfix: crash in some circumstances when avoid_crossing_perimeters is enabled. #2266
Bump version number
Merge branch 'master' of https://github.com/alexrj/Slic3r

Conflicts:
	lib/Slic3r/GUI/Tab.pm