compatible with perl 5.10
Made thread "safe" DBI

Now each time the classes call for the DBI module, they get nothing
* UNTIL * they request for the ->dbi(), which means that each thread (and plugin...) will get their own DBH

Thats the way I did to avoid sharing db handles between threads.

I don't know if this is a bad idea, but it sure does not feel like it now.
fixed so that the DB schema for global settings works
the Jira plugin works now (only Support.pm  still does not)