Big rewrite of the overlay

Hopefully there will now be fewer problems when adding for the first time

There are slightly fewer hacks (no more overriding P & PV)

OpenCL seems to work but hasn't been tested under 32bit yet - there are still a few outstanding but about the install location

All the ebuilds that are in portage / x11 overlay have been appended with r50 to make it easier for me to maintain and hopefully cause fewer issues when ebuilds are bumped without me
noticing

I'm still no where near figuring out how to get a single ebuild to successfully compile both 32 & 64 bit libraries for anything other than the simple ebuilds (if anyone figures it out
please do let me know) - I think the x11 overlay guys have been tinkering with this though

As always please direct bugs to https://github.com/FireBurn/Overlay and if you have any comments / queries feel free to use the Gentoo forums
http://forums.gentoo.org/viewtopic-t-886398.html

Cheers again

Mike