relax SVN archive

Big set of changes enabling the auto-generation of the GUI user function front ends.

This will create user function objects which are bound to the menu items, and the user function page
objects automatically from the user_function data object. The pipe user functions have been updated
to supply the needed data, and additional arguments have been added to the Uf_container.add_keyarg()
method. The Uf_container object can now accept additional wizard related variables.

The graphics package image variables are now imported into the paths module.

This is for backwards compatibility with the old user function pages.

Shifted a number of the image path variables from the gui.paths module to the graphics package.

Whitespace fix.

The user function GUI menu item is now being auto-generated.

This will require future work to support user functions not within a user function class.

The graphics.fetch_icon() function now returns None if no icon is specified.

Created the graphics.fetch_icon() function for a better API for the icon paths.

This will eventually replace the gui.paths module.

The graphics directory has been converted into a Python package.

This will be used to store special functions related to graphics manipulation, retrieval, etc.

Renamed the gui.user_functions package to gui.uf_pages to avoid import clashes.

This package was clashing with the base user_functions package, breaking imports everywhere.

Started to write the auto-generated user function GUI menu.