Replace usage of mesh.faces with mesh.polygons

- Check for keymap availability to suppress warning messages when running
  blender in background mode

indentation edits and copy pyrimid from contrib (where I had made some edits), removed so this wont happen again.

The fracture object was always created on layer 1 only (when this layer is not visible, ops.object.editmode_toggle hence failed). Now creating the fracture objects on current active layer(s).

Plus a few styling enhancements.

[[Split portion of a mixed commit.]]

- remove/comment unused variables
- remove unused imports
- fixed some bugs using incorrect variables

*Commented out non-manifold check on returned shards, it prevented open meshes to be fractured (e.g. Suzanne).
*Enhanced UI of Fracture Group op.

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.]]

scripts tested as working

removed warning
updated api number

Missed these changes in last patch commit, had to manually merge due to changes in Extensions SVN 1010-1012. 

- comforming after my commit in bf-blender:
  - removed the categories from addons names
  - made 'version' a tuple of integers
  - added 'api' field
  - formatted wiki and trackers pages and added where needed (empty pages are yet to be written by the authors though)

- more conforming:
  - 1 tab = 4 spaces

- please check everything is fine in case I made some gross mistake

- mesh_surface_sketch.py
- render_renderfarmfi.py
- space_view3d_align_tools.py
- object_cloud_gen.py

also move bl_addon_info to the top for faster parsing.

These scritps still need changes related to parent classes
- mesh_surface_sketch.py
- render_renderfarmfi.py
- space_view3d_align_tools.py
- object_cloud_gen.py

Applying [#22844] Fix for Fracture Tools, by Markus K. (markus111)
http://projects.blender.org/tracker/index.php?func=detail&aid=22844&group_id=9&atid=127

Sorry for the inconvenient, thanks!

moved fracture/ to object_fracture/ so that appears near the other object_ scripts