relax SVN archive

Fix for the Analysis_controller.delete_analysis() method for when the last page is deleted.

The gui methods are now called properly and the switch to the previous page is not attempted.

Created a new menu item 'File->Close all analyses'.

This closes all analyses and resets the relax data store.

Added the dialog-close oxygen icon to the paths module.

Added the 16x16 and 48x48 versions of the dialog-close oxygen icon.

Missing import.

The notebook switches to the previous page if the current one is deleted now.

The notebook will now switch to a newly added analysis.

The number of analyses and current one are now being tracked.

Created the new Analysis_controller.analysis_data_loop() for returning the relax data store containers.

Created the new Analysis_controller.current_analysis_name() for returning the current analysis name.