Log Message:
Update to sawfish-1.3.1, add DESTDIR support and update HOMEPAGE.

* configure.in: version 1.3.1 - This version is to let people know
  that Sawfish is being revived by the community, and we are awaiting
  patches to be submitted for incoming 1.3.2 release
* fixed possible buffer overflow in src/fonts.c (Yoshiaki Kasahara)

1.3.1 also has many updated translations and doc fixes.