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/sceneRender.c

@@ -2016,17 +2016,21 @@ PyObject *RenderData_EnableSGICosmo( BPy_RenderData * self, PyObject * args )
 //------------------------------------RenderData.OldMapValue() -----------
 PyObject *RenderData_OldMapValue( BPy_RenderData * self, PyObject * args )
 {
-	return M_Render_GetSetAttributeShort( args,
-					      &self->renderContext->framapto,
-					      1, 900 );
+	PyObject *tmp = M_Render_GetSetAttributeShort(args,
+		&self->renderContext->framapto, 1, 900);
+	self->renderContext->framelen =
+		(float)self->renderContext->framapto / self->renderContext->images;
+	return tmp;
 }
 
 //------------------------------------RenderData.NewMapValue() -----------
 PyObject *RenderData_NewMapValue( BPy_RenderData * self, PyObject * args )
 {
-	return M_Render_GetSetAttributeShort( args,
-					      &self->renderContext->images, 1,
-					      900 );
+	PyObject *tmp = M_Render_GetSetAttributeShort(args,
+			&self->renderContext->images, 1, 900);
+	self->renderContext->framelen =
+		(float)self->renderContext->framapto / self->renderContext->images;
+	return tmp;
 }
 
 //------------------------------------RenderData.getTimeCode() -----------