update_tag() tags for depsgraph update only, update() executes normal recalculation and creates edge data.

- Display the right docstring for ply files
- Add a filter to *.stl on importing stl files

also made some pep8 corrections

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.]]

- in wiki page urls: "File_I-O/"     -> "Import-Export/"
- in categories:     "Import/Export" -> "Import-Export"
- 1 tab to 4 spaces
- some tuple formatting, just to be very picky :P

by Filiciss Muhgue (filiciss). Thanks a lot!

Part 2: Extensions

- 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

converted to meshes, making export fail with empties and armatures.

- can export multiple objects (all selected, not only active one)
- can import multiples stl file at once with the file selector

- 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

- every script is now (2,5,3)
- added warning field in bl_addon_info so every dev knows about this: when "warning" field is not empty, a warning icon appears and text alerts 
users about a buggy script (this is used during development, released scripts should must have this empty of course)
- formatted scripts info like this
  - GPL
  - docstring
  - bl_addon_info
  - imports
  so that the actual script starts after the bl_addon_info dict
- removed old 2.4x cruft like __url__, __bpydoc__, __author__ etc, not needed anymore (when the case integrated info with bl_addon_info and in 
case of one email meta just put it in the GPL)

- next commits I plan to do contrib scripts and conform io scripts naming 

- fixed url in add_mesh_gemstones.py, the page existed 

- created pages with a gentle "to-be-written" warning where needed
  and fixed urls in:
  - add_mesh_archimedean_solids.py
  - io_mesh_stl/__init__.py

  See:
  http://wiki.blender.org/index.php/Extensions:2.5/Py/Scripts/Add_Mesh/Archimedean_Solids
  http://wiki.blender.org/index.php/Extensions:2.5/Py/Scripts/Mesh/Surface_Sketch
  http://wiki.blender.org/index.php/Extensions:2.5/Py/Scripts/File_I-O/STL
  http://wiki.blender.org/index.php/Extensions:2.5/Py/Scripts/File_I-O/Camera_Animation

Not nice to send people to non-existing pages :)