So this implies quite a change for files.
Sorry about conflicts which will be caused.
directory Interface::CGI should now be dropped.
I noticed that many scripts (reports ones, but also some circ/stats.pl or opac-topissues) still use Date::Manip.
* synch with rel_2_2. Probably the last non manual synch, as rel_2_2 should not be modified deeply.
* code cleaning (cleaning warnings from perl -w) continued