Fixed the shebang lines on the Python scripts.

Also, removed the one from modules/python/src2/cv.py and cleared its
executable bit, since it's not a script.

modules/python/src2/cv.py

@@ -1,3 +1 @@
-#/usr/bin/env python
-
 from cv2.cv import *

modules/python/src2/gen.py

@@ -1,4 +1,4 @@
-#/usr/bin/env python
+#!/usr/bin/env python
 
 import sys
 from string import Template

modules/python/src2/gen2.py

@@ -1,4 +1,4 @@
-#/usr/bin/env python
+#!/usr/bin/env python
 
 import hdr_parser, sys, re, os, cStringIO
 from string import Template

modules/python/src2/hdr_parser.py

@@ -1,4 +1,4 @@
-#/usr/bin/env python
+#!/usr/bin/env python
 
 import os, sys, re, string