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.

MDL-20366 removing the ability to add new activities to invisible sections, I do not think we should encourage this kind of tricks

MDL-24316 adding support for stealth sections on course edit page - work in progress, we need to decide how to visualise it and what lang strings to use

MDL-22950 adding new component column to the files table, unfortunately this change requires changes in all 2.0dev code, please review all custom code that was already upgraded to 2.0; fixing multiple problems and regressions in mod/assignment

course-section MDL-22262 Added a summaryformat field to the database and implemented it when editing/viewing sections and backup

MDL-21693 Dropping _utf8 suffix from language codes and folder names; enabling new string managers - please note the transition is not yet fully complete because we need to wait for git to recognize the renames in cvs

MDL-20700 coding style cleanup - cvs keywords removed, closign php tag removed, trailing whitespace cleanup

MDL-19794 Updated topic and course format's use of popup_form for temporarily working with new outputlib code. Will eventually need proper upgrading.

The code to print blocks in now in theme layout.php files. (Or in
moodle_core_renderer::handle_legacy_theme)

Code for printing blocks everywhere else has been stripped out.
(Total diffstat 1225 insertions, 2019 deletions)

The way the HTML for a block instance is generated has been cleaned
up a lot. Now, the block_instance generates a block_contents
object which gives a structured representation of the block,
and then $OUTPUT->block builds all the HTML from that.

How theme config.php files specify the layout template and block
regions by page general type has been changed to be even more flexible.

Further refinement for how the theme and block code gets initialised.

Ability for scrits to add 'pretend blocks' to the page. That is,
things that look like blocks, but are not normal block_instances.
(Like the add a new block UI.)

Things that are still broken:
 * some pages in lesson, quiz and resource. I'm working on it.
 * lots of developer debug notices pointing out things that
   need to be updated.

MDL-18293 removed obsoleted checking of return values from insert and update_record + unused strings cleanup

The new names are documented on
http://docs.moodle.org/en/Development:Convert_Draftarea_Files

cleanup: MDL-17083 Remove the old teacher, teachers, student and students columns from the course table.

For something that has been deprecated for over two years, they were still used in a lot of places!