relax SVN archive

Created the Tools->System Information menu entry, which is simply the sys_info user function front end.

Created the GUI front end to the structure.read_xyz user function.

The relax controller now accepts Ctrl-A to select all text.

Fix for the relax controller find dialog on Mac OS X with wxPython 2.9.

The dialog Show() method now needs to be called. This should not affect wxPython 2.8 behaviour.

The relax controller now shows the relax intro text to mimic the prompt/scripting modes.

Previously the text was being printed prior to the initialisation of the controller and was being
lost.

Introduced the empty() method into the structure API to check if structural data is loaded.

This will be used in the spin loading wizard of the spin viewer window.

Converted the structure.read_xyz user function front end to the new design.

This will be used later for introducing this into the GUI.

Small print out fix for the Mac OS X framework checking script.

Reintroduced the relax intro print out when running in info mode (relax --info).

This was removed from the info print out in the last commit, and this reintroduces it at the start
up level.

Improved details of relax and the compiled C modules from the info print out.

The relax introduction has also been removed so it is not printed from the sys_info user function.