relax SVN archive

Converted About_relax into the About_base base class, and added About_relax which inherits from it.

Created a basic, incomplete dialog class for the 'Help -> About relax' menu entry.

The class About_relax has been added and is initialised in the GUI main class. This basic dialog
has no window decorations and automatically closes when clicked with the left mouse button.

Again the splash screen has been temporarily disabled.

This was accidentally turned back on.

Renamed the aboutrelax() method to about_relax() and added a docstring.

Name fixes for the GUI about dialog.

The function gui_bieri.about.about_relax() has been renamed to gui_bieri.about.show_about_gui() to
better reflect an action. The class method aboutGUI() has been converted to the relax convention
and is now called about_gui().

Switched back to using wx.BitmapButton rather than wx.lib.buttons.GenBitmapTextButton.

The GenBitmapTextButton button style did not match the rest of the buttons in relaxGUI.

Switched from using a cone angle to using an order parameter in the isotropic cone frame order model.

Bug fix for the running of the test suite.

The interpreter _on() and _off() methods are now called on() and off()!

Added a 'File -> Save' menu entry.

This is to aid debugging, but users will also find it very useful. Ctrl+S will now save the file
for the user without the file selection dialog box appearing (unless it is the first time). The
state_save() method has now been split into 3:
action_state_save() - for the 'save' actions.
action_state_save_as() - for the 'save as' actions.
state_save() - for doing the actual saving.

Bug fix for the peak list loading GUI element.

The relaxation times were being lost after every click of 'Add'.