Added click handler and selection/deselection of nodes in preparation for archival functionality
Changed notebook_toolbar

Removed the form for adding new notebooks from the graphview dash and replaced it with an archive button.
On selecting any nodes the archive button becomes visible.

Also added some comments
Created a simple archive skeleton function
Implemented hiding the archive if we deselect all previous selected nodes
cleaning
Added an array of selected notebooks to the IPython object in preparation for creation of an archive of the selected notebooks
Implemented simple archiving of notebooks to 'archive.zip'
Added name specification in to archive_gen in preparation for a form to select the archive file.

Disabled the archive button while archiving is in process
Added specification of archive file name via popup text box
removed redundant lines
Disabled refresh button whilst tree is being regenerated