copy qt4 building script from macosx-build-deps to linux
detect if boost build fails, print msg and exit
fix GLU issues caued by mesa split from glu. clarify test error msg
prevent CGAL Floating Point Rounding Mode restortaion errors on PPC64 machines
by altering the cmake build mode from Debug to Release
enable import STL to work on big-endian computers
replace packed struct with union. remove some extraneous/debug code
start Xvfb on random DISPLAY number.
clarify documentation for QT4
clarify dependency on GLU in documentation
put boost back to 1.49
Merge branch 'master' of github.com:openscad/openscad into misc_updates

Conflicts:
	scripts/uni-build-dependencies.sh
Merge pull request #270 from openscad/misc_updates

Big Endian binary STL fix + misc updates