- Add policykit for /usr/local/bin/updater
- Add a script and an installation procedure

* Also, update all po files (with fuzzy)

* Dates arrays: fix declaration with translation
* Makefile: fix for translation files

Remove _() empty string to avoid silly translation

This is in case the new.sh is deactivated!

* Makefile: make installation destination more flexible
* Makefile: clean remaing
* Makefile: remove traling space
* Makefile: simplify scripts copying
* Remove dangerous script enable_passwordless_checks.sh

* Remove useless adjust parameter in settings
* Redesign all preferences
* Add About Page
* Add logo

* New tab for these settings

Also, unify the checkNow and checking menu items, as there is no Cancel anymore

This is not a part of the extension, just an extra utility.

* This runs "apt-get --simulate autoremove" in a script to find autoremovable
packages

* Add update check
* Remove some duplicated strings

* Some bug fixes
* Fairly stable Synaptic-like behaviour:
  - New packages in repository
  - Local/Obsolete packages
  - Residual config files

This imitates the information one can get from Synaptic

- New packages
- Local/Obsolete packages
- Residual config files