Calling check=True on agent/plugin/plugin causes 500

Fixed issue where a server 500 was rendered by attempting
to run a plugin and specify check=True at the same time.
Adding Escaping to Plugin

Added HTML escaping so that argument survive the transfer to the
server. /, %, & etc now get escaped into their %2F like equivalent.

Also moved to differing version. Addded super super-verbose flag.