BPython: bug fixes / patches from trackers

(excuse me for not committing earlier)

Patches by Ken Hughes (thanks for all bug fixes!):

1) Setting a scene's MapOld and MapNew values in python does nothing:
bug #2566 submitted by Dominic Agoro-Ombaka (dmao):
https://projects.blender.org/tracker/?func=detail&aid=2566&group_id=9&atid=125
patch #2571:
https://projects.blender.org/tracker/index.php?func=detail&aid=2571&group_id=9&atid=127

2) Calling the file selector after setting the progress bar crashes Blender:
bug #2418 submitted by Alessandro Garosi (brandano):
https://projects.blender.org/tracker/?func=detail&aid=2418&group_id=9&atid=125
patch #2568:
https://projects.blender.org/tracker/index.php?func=detail&aid=2568&group_id=9&atid=127

3) Menus always generate same event when canceled:
bug #2429 submitted by Campbell Barton:
https://projects.blender.org/tracker/?func=detail&aid=2429&group_id=9&atid=125
patch #2579:
https://projects.blender.org/tracker/?func=detail&aid=2579&group_id=9&atid=127

4) Add a vertex to a mesh with groups using a script and then edit that mesh hangs blender:
bug #2211 reported by German Alonso Tamayo (servivo):
https://projects.blender.org/tracker/index.php?func=detail&aid=2211&group_id=9&atid=125
patch #2580
#https://projects.blender.org/tracker/index.php?func=detail&aid=2580&group_id=9&atid=127

About bug #2033, I'm still looking at it, committing a small fix now.

=====

Patches by Campbell Barton (thanks!):

#2482: BGL pydocs fix broken links
https://projects.blender.org/tracker/index.php?func=detail&aid=2482&group_id=9&atid=127

#2426: Large text in Draw.Text and Draw.GetStreingWidth
https://projects.blender.org/tracker/index.php?func=detail&aid=2462&group_id=9&atid=127

#2521: scene.getActiveObject()
https://projects.blender.org/tracker/index.php?func=detail&aid=2521&group_id=9&atid=127

#2523: NMesh.GetNames()
https://projects.blender.org/tracker/index.php?func=detail&aid=2523&group_id=9&atid=127

- docs also updated

release/scripts/camera_changer.py

@@ -17,10 +17,11 @@ __bpydoc__ = """\
 This script creates an script link to change cameras during an animation.
 
 The created script link (a Blender Text) is linked to Scene Frame Changed events.
+
 Usage:
 
-Run the script, then name the camera Object with the number of the frame(s) where you
-want this camera to become active.
+Run the script, then name the camera Object with the number of the frame(s)
+where you want this camera to become active.
 
 For example:<br>
   - a camera called "10" will become active at frame 10.<br>
@@ -30,6 +31,8 @@ Notes:<br>
   - This script creates another script named camera.py, which is linked to the current scene.<br>
   - If there is already a text called "camera.py", but it's from an old version or is not recognized,
 you can choose if you want to rename or overwrite it.
+  - Script inspired by Jean-Michel (jms) Soler's:<br>
+    http://jmsoler.free.fr/didacticiel/blender/tutor/cpl_changerdecamera.htm
 """
 
 
@@ -57,7 +60,7 @@ you can choose if you want to rename or overwrite it.
 # ***** END GPL LICENCE BLOCK *****
 # --------------------------------------------------------------------------
 
-#Script in the same idea that this one :
+#Script inspired of the idea of this one :
 #http://jmsoler.free.fr/didacticiel/blender/tutor/cpl_changerdecamera.htm
 #
 #----------------------------------------------