relax SVN archive

Fix for the spin viewer window for MS Windows.

The get_info() method now catches if no item is selected in the tree before trying to get the Python
data from it. Asking for Python data from a missing TreeCtrl item ID works on GNU/Linux and Mac OS
X, but not on MS Windows.

Bug fix for MS Windows - the main relax window is now maximized on start up.

Improved the print outs of the scons 'binary_dist' target for Mac OS X.

Modified the 'clean' scons target to remove the py2app build and dist directories.

Created the 'scons binary_dist' target for Mac OS X.

Typing 'scons binary_dist' on a Mac will now create a DMG image of a universal Mac OS X application.

Added the Mac OS X DMG distribution file names to the scons script.

Modified the setup.py file so that the Mac OS X .app creation code is in the mac_setup() function.

This will be used by the scons system later on.

Updated the hdiutil command options for the Mac OS X DMG file creation.

Added instructions to the setup.py file for creating a Mac OS X DMG distribution file.

Removed the GUI wait_for_interpreter() method as this is replaced by the intepreter flush() method.