fixed links to point to correct locations, more descriptive labels
centered prefs dialog on main window
Mac OS X: if 10.4 SDK is not found, use pkg-config. Link Zlib and GLU. #90
Clean up of SCons in preparation to move to CMake (#1)
Fixed url opening on linux and Mac.
Merge branch 'master' of git://github.com/freemancw/GtkRadiant
Merge remote-tracking branch 'etlegacy/master'
Set the default packs, pull the invocation environment into the scons Environment (for pkg-config)