Improving packages Manager columns and filtering

See https://github.com/joomla-projects/com_localise/issues/238
after patch you will get:

![screen shot 2014-11-11 at 11 10 10](https://cloud.githubusercontent.com/assets/869724/4991403/58ea4f6c-6993-11e4-9a82-62ecaa0d1577.png)