Version 0.6.6

* redesigned the main menu (icons from http://openiconlibrary.sourceforge.net)
* fix: confirmation dialog has wrong parent set
* fix: repos with blank "distribution" cause apt to fail
* fix: crash when trying to update catalogs with all repos disabled
* reset category filter to default when returning to main menu
* improved error/warning messages in certain situations
* show the maintainer field for packages