EMBOSS 1.3.1

[ableasby at hgmp.mrc.ac.uk]

Quite a lot of "stable" releases lately. We are getting close to
a more general announcement though.

1.3.1 fixes a problem in indexing when long filenames are used.
It also includes a patch from Nicolas Joly for the word matching
NUCLEUS code (compilation problems) and addition of GFF code
for DIFFSEQ.

Alan