mds: install squid configuration
mds: install contrib files in /usr/share/mmc/doc/contrib/
mmc: reorganize contrib files

- move mds contrib files in the mds project
- store all contrib files in $(datadir)/doc/mmc/contrib/
mds: bump version to 2.4.93 (RC)
mmc: distribute contrib files

Also generate squid PO files
squid: add pt_BR po file
squid: fix initial configuration

Generate correct configuration for Mandriva
core: bump version to 3.0.97 (RC)
packaging: fix sarg binary path on Mandriva
squid: fix list names
squid: update squid translations

Closes #2030
doc: add squid module
doc: update squid documentation

Closes #2031