Grow narrow infill regions into void - to be tested more
Fix narrow fills growing
Merge branch 'master' into grow-narrow
Merge branch 'master' into grow-narrow
Merge branch 'master' into grow-narrow
Merge branch 'master' into grow-narrow

Conflicts:
	lib/Slic3r/Fill.pm
	lib/Slic3r/Print/Object.pm
Merge branch 'grow-narrow' of github.com:alexrj/Slic3r into grow-narrow
$surface->thickness was erroneously defaulting to 1 mm
Bugfix: horizontal projection for high-res models might show corrupted result
Don't exclude any infill under internal bridges; revert infill pattern to rectilinear for internal bridges. #240
Merge branch 'grow-narrow'