relax SVN archive

Created the sequence.copy and sequence.write user function pages and menu entries.

Updated the sequence.read user function page to use the user function documentation.

Converted all the sequence user functions to use the new documentation design.

The residue user function pages now use the new documentation system.

Fix for the spin viewer window when the currently selected tree element is deleted.

The display() method now checks if the info structure is set to None.

Fix for the molecule.create user function page.

The wrong args was passed to the user function.

Improvements to the residue user function documentation.

More layout changes for the relax_data.read user function page.

Removed 2 stretchable spacers at the end of the user function page which were causing layout issues.

Add the divider, padding and spacing args to the wizard page file_selection() method.