relax SVN archive

Implemented the sys_info user function GUI page and menu entry.

The help-about.png oxygen icon is now available on the help_about path.

Created the front and backend of the sys_info user function.

This displays the same text as 'relax -i'. This will be useful on the Mac OS X app, as the command
line is not available.

The GUI prompt window is now also deactivated with the execution lock.

This will prevent race conditions as previously the user was able to execute any user function or
manipulate any of the data in the relax data store, while execution was in progress!

More of the main menu entries have been disabled with the execution lock to prevent racing.

The spin loader toolbar button in the spin viewer window is now properly disabled with the exec lock.

Created a grey-scale version of the 32x32 spin icon to be used in the spin viewer window.

The spin loader button in the spin viewer window is now deactivated with the execution lock.

The NOE and Rx peak list wizards have been reverted to the form prior to r14689.

This, combined with the previous commit causing on_apply() to do nothing by default, should now
finally eliminate the Mac OS X bug causing a crash in these wizards.

The wizard page base method on_apply() now does nothing.

This should help eliminate Mac OS X bugs. The on_display() and on_display_post() methods are no
longer called by on_apply() by default, as the page should not be reset when clicking on apply.