*python documention & bug fix

- added documentation to Render - saveRenderedImage has an option to save the zbuffer along with the image
(off by default)
- fixed a really annoying runtime error of uninitialized data being passed to a method in pipeline.c during a render

source/blender/python/api2_2x/doc/Render.py

@@ -107,11 +107,13 @@ class RenderData:
     Render a series of frames to an output directory.
     """
 
-  def saveRenderedImage(filename):
+  def saveRenderedImage(filename, zbuffer=0):
     """
     Saves the image rendered using RenderData.render() to the filename and path
     given in the variable 'filename'
     @param filename: The path+filename for the rendered image.
+    @type zbuffer: int 
+    @param zbuffer: Whether or not to render the zbuffer along with the image.
     @type filename: string 
     @since: 2.40
     @requires: You must have an image currently rendered before calling this method

source/blender/python/api2_2x/sceneRender.c

@@ -918,6 +918,8 @@ PyObject *RenderData_SaveRenderedImage ( BPy_RenderData * self, PyObject *args )
 	if( strlen(self->renderContext->pic) + strlen(name_str) > sizeof(filepath)-1 )
 		return EXPP_ReturnPyObjError( PyExc_ValueError, "full filename too long" );
 
+	if zbuff !=0	zbuff = 1; //required 1/0
+
 	BLI_strncpy( filepath, self->renderContext->pic, sizeof(filepath) );
 	strcat(filepath, name_str);
 

source/blender/render/intern/source/pipeline.c

@@ -1070,7 +1070,7 @@ static void threaded_tile_processor(Render *re)
 	RenderPart *pa, *nextpa;
 	RenderResult *rr= re->result;
 	rctf viewplane= re->viewplane;
-	int maxthreads, rendering=1, counter= 1, drawtimer=0, hasdrawn, minx;
+	int maxthreads, rendering=1, counter= 1, drawtimer=0, hasdrawn, minx=0;
 	
 	if(rr==NULL)
 		return;