MLJS add ons, semantic and content search interaction, triple widgets

Added Term query support to Query Builder
Added ability for multiple widgets to contribute query terms to the
same structured query in the search context
Added support for linking subject semantic results directly to a
content context to view all related documents for all subjects that
match a query
Added CSS styles for bootstrap compatibility and MLJS consistency
Tweaked rdb2rdf wizard to complete full import of entire table
Added ability for a searchbar to contribute to a structured query as a
term query rather than just with the default grammar