Major tasks undertaken in this patch:
* New format_text argument, overflowdiv.
* New page layout Report.
* Review of all format_text calls.
* Added support for the report layout to all themes.
* Changed forum post display from tables to divs.

Activity backups do not contain these details so I just put all the
block into one if-statement.

backup MDL-24103 Better error messages when a user attempts to restore invalid backup file formats such as moodle 1.9 backups

"MDL-23910, improved restore pre-ui, removed treeview, list  backup files in tables and sorted by created time"

backup MDL-23727 The proceed button is now to the right of the screen and the cancel button throws a confirmation box.

The course import now makes use of the backup and restore processed and the backup UI to allow the user to import one course into another.
The new UI is much the same as the backup ui except preceeded by a course selector to choose the course to import from.

* Root settings are now check boxes rather than selects
* Language strings adjusted as requested
* Final continue on backup now redirecteds to restore pre ui

* Category + course selectors now perform required capability checks
* Show/Hide settings from UI tested and implemented for overwrite_conf setting
* Final continue button is GET rather than post
* Temp zip file is deleted after successfull extraction
* Removed previous button from settings stage MDL-23480

    *  backup moodleforms for specific stages are now cached between stage processing and display making it possible to leave all validation up to the bridge.
    * The backup stage now relies entirely on the backup controllers save, load, and check methods + dependency checks rather then previous stage processing to ensure accuracy.
    * filename is now a required field and validated to ensure it ends with .zip and is a valid filename.
    * There is now a previous button for backup stages after the initial and before the complete.
    * The progress bar previous stages are now links as well allowing the user to jump to previous stages (not linked on complete of course).
    * The root settings are only shown on the schema stage now if they were changed because of dependency.
    * Stages are now numbered in the progress bar.
    * The complete page now shows a notice that the backup was complete and provides a continue button to view the backup file.
    * Adds administration blocks to the backup pages.

backup MDL-22142 This is the user interface for backups, several minor/cosmetic issues still to be ironed out. See the tracker for details