Update gprof2dot.py (see gprof2dot.py git) 

It's old version, see git here :
http://code.google.com/p/jrfonseca/source/browse/gprof2dot.py?repo=gprof2dot
Download here :
http://gprof2dot.jrfonseca.googlecode.com/git/gprof2dot.py