merging CALLGRAPH_BRANCH

[Philippe E. <ph...@wa...>]

Here the kernel patch and some explanation on how to use it:

http://perso.wanadoo.fr/phil.el/

the file format has been changed, if you cvs update your tree
you'll need an opcontrol --reset to remove all old samples files.

opstack utility is not yet full featured. I don't consider
it as ready for use but if you to play with ... to get better
results you need to profile with --separate=library

regards,
Phil