Fix regression in Quick Slice and Slice to SVG
Strip all png images to avoid libpng warning
Merge pull request #2135 from hroncok/iccp

Strip all png images to avoid libpng warning
Refactored OptionsGroup class for cleaner OOP model and cleaner event model
Enable/disable GUI controls according to the others in order to guide the user through option dependency
Minor adjustment in tooltip
Initialize controls status when loading cut window
Fixed background processing with multiple worker threads
Fixed regression causing variable layer heights to be ignored. #2136

Conflicts:

	xs/xsp/my.map
Enable min_fan_speed and disable_fan_first_layers when fan_always_on is checked
Toolpaths preview
Added unit tests about temperatures being preserved in spiral_vase mode
Merge branch 'master' of github.com:alexrj/Slic3r
Don't use wxStaticBox objects as parents. #2150
Fix toolpaths preview when objects have distinct layer heights
Include support material in toolpaths preview
Proper handling of interlaced layers in toolpaths preview
Added button for toolpaths preview
Fix scaled model objects causing a test to fail
Remove --bed-size from --help output