Use "file" and "layer" in import_* instead of "filename" and "layername"
(the old argument names are still supported for compatibility)
git-svn-id: http://svn.clifford.at/openscad/trunk@235 b57f626f-c46c-0410-a088-ec61d464b74c
Fixed inner-borders-bug in 2d visualization
(symptom: rendering artefacts even with higher
convexity setting as it should be needed)
git-svn-id: http://svn.clifford.at/openscad/trunk@214 b57f626f-c46c-0410-a088-ec61d464b74c