bmesh py api: add bmesh.update_edit_mode(), there was no way to redraw the 3d view or re-calculate face tessellation from python.

add py template for editing meshes in editmode.

also remove double call to CTX_wm_region which does a string lookup.

release/scripts/templates/bmesh_simple_editmode.py

@@ -0,0 +1,23 @@
+# This example assumes we have a mesh object in edit-mode
+
+import bpy
+import bmesh
+
+# Get the active mesh
+obj = bpy.context.edit_object
+me = obj.data
+
+
+# Get a BMesh representation
+bm = bmesh.from_edit_mesh(me)
+
+bm.faces.active = None
+
+# Modify the BMesh, can do anything here...
+for v in bm.verts:
+    v.co.x += 1.0
+
+
+# Show the updates in the viewport
+# and recalculate n-gon tessellation.
+bmesh.update_edit_mesh(me, True)