Don't return the cached bounding box but clone it
Fix regression causing complete_objects to skip Z moves after first object is complete. Includes regression test. #1582 #1541
Merge branch 'stable'
Initial work for porting Slic3r::Config to XS
Raise version number in master branch
Fixed regression in object placement in STL export. #1552
Merge branch 'stable'
Merge branch 'xs-model'

Conflicts:
	lib/Slic3r/Model.pm
Handle read_from_file() exceptions in GUI. #1619
Fixed fatal error about missing method thin_walls(). #1607 #1615
Fixed wrong commit f495136. Thanks pdbogen for the report. #1623
Merge branch 'xs-model'
Merge branch 'xs-model'
More work for porting Config to XS
More work for XS Config
Support bool options in XS
Support enum config options
Support for more array config types
Inline serialize() and deserialize() for ConfigOptionEnum
Decoupled a generic Config implementation from the PrintConfig definitions