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

source/blender/python/api2_2x/Window.c

@@ -25,7 +25,8 @@
  *
  * This is a new part of Blender.
  *
- * Contributor(s): Willian P. Germano, Tom Musgrove, Michael Reimpell, Yann Vernier
+ * Contributor(s): Willian P. Germano, Tom Musgrove, Michael Reimpell,
+ * Yann Vernier, Ken Hughes
  *
  * ***** END GPL/BL DUAL LICENSE BLOCK *****
 */
@@ -601,6 +602,7 @@ static PyObject *M_Window_DrawProgressBar( PyObject * self, PyObject * args )
 	float done;
 	char *info = NULL;
 	int retval = 0;
+	ScrArea *sa = curarea;
 
 	if (G.background)
 		return EXPP_ReturnPyObjError(PyExc_RuntimeError,
@@ -613,6 +615,8 @@ static PyObject *M_Window_DrawProgressBar( PyObject * self, PyObject * args )
 	if( !G.background )
 		retval = progress_bar( done, info );
 
+	curarea = sa;
+
 	return Py_BuildValue( "i", retval );
 }