Invalidate shared vertices
Prevent admesh to reverse all facets twice in some mostly-random situations.

Normalizing a null normal should still return a null normal in order to fix it properly later
instead of treating it as if it was a true normal and thus reversing the facet (and if that is
the first facet, all of the others would be reversed as well).
Ability to export OBJ from the library
Use fread() to read facet number
Bugfix: some binary STL files were not correctly parsed on Windows
Also increase volume when scaling
Set vaiables to NULL after free
Rename variable new to newn
Removed commented out code
Slic3r compatibility commit
Use VERSION variable in output
Header for stl_translate_relative
If VERSION is not defined, don't blow up (for Slic3r)
Back to the admesh messages, delte commented code