Updated fis-gtm location and vista VCS url.

Updated location of fis-gtm (version number in directory) and vista package VCS
url.
Restore FOIA date as upstream package version.

The latest FOIA release of VistA happened on April 5th 2013.
We are using this date as the upstream version identifier for
the vista-foia package, as 0.20130405.

This follows debian policy:

Section 3.2.1 "Version numbers based on dates"
http://www.debian.org/doc/debian-policy/ch-binary.html