Allow SPADE/PolyglotDB scripts to be run through the UI or by REST api call

[MichaelGoodale]

This would entail having a new tab on the main website which would list the different SPADE scripts and allow users to run them through the ISCAN interface, through like a subprocess or something.

It could also work through a REST api call rather than just the UI.

This is mainly useful as it allows us to bypass all the issues with unix permissions we've been having(as the server will be run under a different account than the users).