Boost: Support using regexp from Boost even if TUNDRA_NO_BOOST is defined. This is needed for gcc/clang builds that use a libstdc++ that does not yet implement regexp (its coming in gcc 4.9). Rework all boost related cmake to have less constant check if boost this or that is enabled, do it all inside the configure and link functions, these are now always safe to call. Explicitly link to boost only in modules that really use regexp (and where the inheritance from TundraCore does not work. Windows still uses prage auto-linking as before.
Meshmoon Linux: Make clang the default compiler, using gcc-4.9 from a non default ubuntu repo is not a good solution. Still uses libstdc++. This is still work in progress and has to be verified with a clean Ubuntu installation...
Boost: Move boost related cmake stuff to its own file, like ogre and dx.
Meshmoon Linux: Update build scripts to build headless Ogre that wont link to x11. Ogre is rebuilt every time rocket/server mode is changed. This should enable a truly headless Meshmoon Server.