relax SVN archive

Created the BMRB export window.

This includes the following elements:
- A title with description and BMRB icons.
- The data pipe selection element.
- The relaxation data meta data GUI element.
- The molecule list GUI element.
- The software list GUI element.
- The script list GUI element.
- The citation list GUI element.
- Buttons for previewing, exporting, and cancelling.

The action_export_bmrb() method now opens the BMRB export window.

Fix for the GUI for when a script is launched from the command line.

The analysis tabs are now updated at the end of the __init__() method, and the ds.relax_gui data
store object is no longer overwritten if it already exists.

Bug fix for running a script when launching the GUI.

This was completely failing. Now the script is executed prior to the launching of the GUI.

The base list objects are now updated when pipe changes occur.

Created a 100x100 version of the BMRB logo - this will be used for the export window.

The spin viewer window now uses graphics.fetch_icon() and shows the button text in the toolbar.

The showing of the toolbar text is simply to help the user understand the window quicker.

Added the mimetypes/text-x-texinfo.png Oxygen icons. This is for the relaxation data metadata button.

Improvements and fixes for the GUI pages of the bmrb user functions.

Merged the spectrum list GUI element into the base list element.

The base list element now has a delete() method, though I'm not sure if it is ever used. Now all
list GUI elements are derived from the Base_list class. This will simplify changing or improving
all of these elements.