Crash when loading a .stl file

[tytouf]

The application crashes when loading a .stl file.

I connected gdb and it looks like the mesh->tdata and mesh->vdata are not correctly allocated when loading the .stl file.

Changing line 24 in libfab/formats/stl.c:
mesh_reserve_v(mesh, mesh->vcount_3);
with
mesh_reserve_v(mesh, mesh->tcount_3);
prevent the crash but then it does not seem to work correctly as my object is not displayed.

[tytouf]

I pushed a fix for that.

Unfortunately even after applying the fix, the model is not correctly rendered in the glcanvas.