relax SVN archive

Simplified the local variable names in add_execute_relax().

The following have been renamed and shifted into the local namespace:
self.label_5_copy_1_copy_3 -> label
self.relax_start_modelfree -> button
exec_relax_copy_1_copy_3 -> sizer

Added a docstring and comment to the cancel_calculation() method (which does nothing right now).

The controller close button is now always accessible.

The controller close button now works better.

The method close_log() is now called handler_close(). Instead of calling self.Destroy(), it now
calls self.Close() allowing the controller to be re-opened.

Added access to the relax controller from the main window.

The 'View' menu has been created with the single entry 'Controller'. This has a new oxygen icon.
The menu entry executes the show_controller() method which simply calls self.controller.ShowModal().
The controller will need to be modified to be universally accessible and closable at any time.

Commented out the thread creation in the Controller.

These will be created by the specific analyses.

The controller is now being built and stored in the main GUI object.

This is accessible as self.controller or in other GUI objects as self.gui.controller. To see the
controller, its ShowModal() method must be called.

Import fixes for the relax controller window.

Renamed the 'relax_control' module to 'controller'. There is no need to prepend 'relax_' to this.

Renamed the Log_window class to Controller, as this dialog will be more than a log window.