Add G3 and digifax support
@hadess
Submitted by Bastien Nocera Link to original bug (#410622)
Description
From the sendfax man page: " The g3 files can be created with pbm2g3(1) or GNU’s GhostScript with the "digifax" driver. "
g3cat has some more information about the digifax format: http://mgetty.greenie.net/doc/g3cat.man.html