Fix up 3dec format in -T.

The vertices of a face are now listed clockwise when looking the
polyhedra from outside (i.e. the face normals are pointing inwards).
Add tessellation transformations in -T.

Added option -transform for arbitrary (linear) transformations of the
tesses.  The transformation can be any combination of shift / scaling /
rotation.

An example is as follows:
neper -T -n 1000 -id 1 -domain cube 0.1 1 1 \
	 -transform "scale(10,1,1):rotate(0,1,0,45)"
Update version.
Fix up bug occuring when Gmsh fails in -M.

The case where Gmsh fails to mesh was not captured properly, which in
the end gave a memory error (Segmentation fault).

Also fixed up a compilation warning (Centos).