ENH: Remove references to fig2dev

The project does not depend on fig2dev because there are no *.fig
files in the SoftwareGuide/Art directory.

Also, there's no "GeneratedFiles.txt" in the folder or in the code
of the project.

Change-Id: I61e2425a8390ce50f2603e3d4d75862154a52d44
Merge "ENH: Remove references to fig2dev"