Allow for permissions to be registered dynamically. This will
allow for the ability for models and plugins to register permissions.

Detach conversation thread from ticket to make it more generic. Any object
can now have its own thread complete with entry type and attachments.

The commit also renames some fields in department table.

Multilanguage Support via gettext

- added gettext encapsulations to all texts i thought necessary
- added fallback function for the case that the gettext extension isn't loaded
- added browser language detection
- added gettext to the list of optional extensions in setup
- rewritten some of the texts to use sprintf instead of appending strings
- added german translation file
- removed mark_overdue-confirm from cannedresponses.inc.php

extend multi language support and a fex fixes

- Better detection of translation files
- Added functionality to redirect language codes (see redirecting
language codes)
- Ticket Status can be translated
- The Datepicker can be translated
- Extended functionality of 'testlang.php' to show what language code is
used to translate

Forgotten to apply a patch from RC5 to RC6

- Forgotten to change $var to $vars in line 380 of class.mailfetch.php
- Removed unneeded comment

Added php_gettext as primary translation engine

- Added php_gettext support (thanks to Danilo Segan and Steven
Armstrong)
- php_gettext is now the primary translation engine
- Extended language detection functionality

Add error/misconfiguration checks and fix undefined variables

Autosubmit form on load - refresh is called on submit giving it form object
Validate start/stop timeframe in the backend

Improve data accuracy - table JOINs
Group by primary keys.

Sort by the 'sort' member of the info array defined for the various tabs of
the report table.

Previously, if a SQL query did not return results for all rows, the results
that were returned would be added to the table in a new column(s) and those
(new) columns would be populated from top down. Therefore, the data would
not correcly line up with the row to which it pertains. Now, results are
matched back to the row to which they pertain, and rows are checked after
each query to ensure they all have the same number of columns.

Most things work, still outstanding
  - the table needs to support filtering like the graphs,
  - the bootstrap.css file needs to be culled of what isn't used for now,
  - g.raphael needs to be re-minned after a issue is filed with g.raphael
    for the snapEnds() function not picking reasonable graph axes.
  - split dashboard.php into several smaller js, css, etc., respective files

Add support for aggregating data together and encoding it according to the
report AJAX specification for the reporting front end.