relax SVN archive

Abstraction of the images and icon paths.

The module 'paths' has been created to hold hardcoded variables pointing to the image and icon
paths. All GUI modules now use this 'paths' module. Therefore if an icon or image needs to be
changed, on change to the 'paths' module propagates to all GUI elements (avoids code hunting when
modifying paths).

Import fixes.

Changes include comments added, alphabetical ordering, and removal of unused imports.

Fixed all the imports in the gui_bieri.execution package.

This includes fixing paths, removing many unused imports, alphabetical ordering, and general clean
ups.

Fixed all the paths to the GUI images.

Fixed the imports in gui_bieri.analyses.relax_control.

The module paths have been fixed for the new layout, the imports alphabetically sorted, and
whitespace fixed.

Fixed the path to the relax_16x16.png image.

Converted the 1st comment in the gui_bieri.relax_gui module into a properly formed module docstring.

Alphabetical ordering of the relax module imports.

Sorted out the Python module imports.

Alphabetical sorting, removal of duplicated entries, collected all string package imports into one
line.

Fixed the relax GUI module imports.

These have also been alphabetically ordered, and a full stop added to the comment!