alien.libraries.finder: Make find-library return the string passed in instead of f if the library is not found. We want vocabularies to load no matter what instead of throwing a missing library error. Also, print dlerror in the error message and take away the redundant line about possible missing libraries. Fixes #986.
opengl.capabilities: Apply @jonenst's suggestions for gl-version failures with mesa opengl.
opengl.capabilities: Try to throw linux Radeon users a bone for getting around having two libGL.so installed.
See http://ubuntuforums.org/showthread.php?t=2228534&p=13044229#post13044229
(Does anyone know the best fix for this!?)
alien.libraries.finder.linux: some fixes to allow "LLVM-3.4" to find "LLVM-3.4.1".
Docs: new stub documentation for vocabs in compiler.cfg
Docs: for compiler.cfg and cpu.architecture words

Conflicts:
	basis/cpu/architecture/architecture-docs.factor
Docs: for cpu.x86
Docs: for cpu.architecture words
Docs: documentation for stack-checker.* and compiler.* vocabs
Docs: for compiler.cfg.regsters
Docs: more docs for compiler.cfg.* words
Docs: more docs for stack-checker.* words
Docs: for compiler, vm and combinators
Docs: for compiler.cfg.* vocabs
Docs: docs for compiler-related words
cpu.architecture: fix using from bad conflict merge.