update addons enabled by default to use 'faces -> tessfaces' also grease pencil scatter and quake map export.

* Remove scene_update from the handlers on unregister.

* Fixed normal calculation (again) for global mode.

* API change: ngon_tesselate -> ngon_tessellate
* Use persistent handler (scene_update in scene_update_post) for geometry calculation to reduce CPU load when idle.
* Remove all properties when add-on is unregistered.
* Minor: Moved text offset constants to the other script constants.
* TODO: Still heavy load while doing simple translation/scaling/rotation though. Is there a way to avoid that?

by default the script now has display distance false
this prevent the script failing to deactivate

* Use ngon_tesselate (bpy_extras.mesh_utils) for quads/ngons

* Calculate surface area & normals for n-gons.
* Fixed normal calculation to return saner values.
* Check prevent volume calculation for n-gons (todo: actually write code for this).

* Unit display in 3D View (Patch by Alessandro Sala: getUnitsInfo & convertDistance)
* Fixed usage of variable name when displaying a property (use empty text).
* TODO: In the future the core functionality of unit conversion could possibly be used directly from Blender C code (=new API function) to avoid redundancy?

* Added support for edge length measurement
* Updated API revision and Blender version
* Rearranged some things to make code clearer - it's still pretty cumbersome :-(.
* Also moved "Update selection" button to the very top.

* Some cleanup in the panels UI structure.
* Non-meshes do not show wrong data now (from previously selected meshes).
* Removed version history/changelog from the script. This is handled by svn/git anyway. 
* Added missing normal&volume comments.

Plus a few styling enhancements.

[[Split portion of a mixed commit.]]

* Volume calculation and mainfold check code by Benjamin Lauritzen (Loonsbury)
* Updated API revision

* Measurement of face normals by TNae + extended to cover all cases.
* Patch link: http://blenderartists.org/forum/showthread.php?177800-Measure-script-%28Blender-2.5x-only%29&p=1896219&viewfull=1#post1896219
* Grouped measured values inside boxes.

* Moved property definitions to registration function.
* Changed automatic callback adding to manual, the current API doesn't seem to allow this top be automatically yet.

"warning": "Script returns errors"

READ THIS TO AVOID A LOT OF WORK!

New way of linking to tracker pages: just use the parameter "aid" (artifact ID),
to avoid a lot of manual updates later in wiki and svn.

Example:
=========

OLD WAY TO LINK TO TRACKER
-----------------------------

Complete url of a script in Upload
http://projects.blender.org/tracker/index.php?func=detail&aid=25349&group_id=153&atid=467

If we move this in contrib this url will become
http://projects.blender.org/tracker/index.php?func=detail&aid=25349&group_id=153&atid=468
467 becomes 468, so we have to update this in wiki page.

Later on, when this moves into Trunk, the url will become
http://projects.blender.org/tracker/index.php?func=detail&aid=25349&group_id=153&atid=469
468 becomes 469, so we have to update the url in wiki page and svn.

Annoying!

NEW WAY TO LINK TO TRACKER
-----------------------------

Best way to link to tracker page is using:
http://projects.blender.org/tracker/index.php?func=detail&aid=25349

Use "func=detail"
Use "aid"            (which is the "artifact ID")

DON'T use "group_id" (which is the project ID, bf-extensions is project 153)
DON'T use "atid"     (which is the "artifacts tracker ID")

Like this, the url is unique, and we will avoid to update wiki pages and svn after moving pages
 


[[Split portion of a mixed commit.]]

* Moved setting of properties to callback function (it is bad practise to set it in the draw code).
* Fixed distance calculation of parented objects.
* API change: add_modal_handler -> modal_handler_add
* Regression: I had to disable area display for selection with more than 2 meshes (for now, still searching for a nice solution).
* Fixed Local/Global vert-loc calculations in EditMode.

* Applied patch by Filiciss Muhgue that (mostly) fixes the quad view. Thanks for that!
* Patch link: https://projects.blender.org/tracker/?func=detail&atid=127&aid=24932&group_id=9
* TODO: Make Quad view more useful (fix text position, display 2D value of the hypotenuse rather than the 3D one)

tested rev:32411

tested as working rev 31965

by Filiciss Muhgue (filiciss). Thanks a lot!

Part 2: Extensions

added warning to panel measure

* See http://lists.blender.org/pipermail/bf-committers/2010-September/028654.html