relax SVN archive

The View menu entries now raise the window to the front if already open.

This is useful when too many windows are open.

The spin.name page is now added to the front of the Rx peak list wizard as well.

This matches the NOE peak list wizard.

Changed the size of the question box.

The spin.name GUI page is now added to the front of the NOE peak list wizard if spins are not named.

The error message box has been replaced by a question box, which if the user says yes to will add
the spin.name user function GUI page to the start of the wizard.

Expanded the spin.name user function docstring.

Shifted the spin ID field to the end of the spin.name user function GUI page.

This is to make it easier for users, as it is often assumed that the first field is the important one.

The proceed_on_error flag is now taken into account by the wizard's finish button.

The Rx peak list wizard now no longer skips to the next page when an error occurs.

The sync flag is now set for all the pages.

All GUI user functions now use the base page execute() method instead of the interpreter directly.

Created the user function base page execute() method for running the user functions.

This will launch the interpreter in either asynchronous or synchronous mode dependent on the sync
flag.