Update changelog

 Fixed mysql check to see if vserver is running

 Add entry to changelog for ninjahelper.1 addition

 Added changelog entry about duplicity globbing support fix

 Added missing changelog entries including trac handler toint()
 function, backupninja.conf.5 additions of "when" and "vservers", and
 trac handler subdir mkdir fix

 changelog cosmetics

 pgsql.helper: forbid the user to choose an empty database set to backup

 ninjahelper: moved (and enhanced) vservers-related functions to lib/vservers. dup.helper, pgsql.helper: use these functions

 Moved more code to lib/ (conffile-related functions, parseini. Added dup helper, using new modular vservers-related functions shared for all helpers.

 Fix: the "Cancel" buttons used to have a weird behaviour... at least

 Fix ChangeLog entry.

 Fix: used to expand '*' in default source directories

Also fixed a bug in the rdiff handler that caused a unary operation error if
the variable wasn't fixed