New XS framework for C and C++ code
Merge branch 'master' into xs
Ported get_layer_range() to C
Cache a Z table for layer range search
Include admesh code for STL repair
Require some recent versions
New automatic built-in STL repair
Merge branch 'master' into xs
Merge branch 'master' into xs

Conflicts:
	Build.PL
Remove --sudo from ./xs too
New Slic3r::TriangleMesh::XS class
Update .gitignore
Merge branch 'master' into xs

Conflicts:
	Build.PL
New Slic3r::TriangleMesh::XS->ToPerl() method
Automatically repair any input STL file
Removed debugging statements during repair
Merge branch 'master' into xs
New ReadFromPerl() method
Fix Build.PL in xs
Merge branch 'master' into xs