Query execution pipeline tidying + support for multiple result sets

[tms]

A number of commits addressing a few key points:

• The server-side parameter parser no longer tries to be "clever", making the implementation far less crazy
• Query-related JavaScript has been refactored and separated so it's not as big of a quagmire, and unused files were removed
• Rendering of the graphs (and tables, but that's less important) is now deferred, just in case the query triggers the graphing code on results where bad things will happen
• You can now get back multiple Slick Grid result sets, and we no longer use random jQuery UI styling on them

To the last point, a toggle is added to the "Results" tab as appropriate, like the following:

It's not perfect, but it's a starting implementation. TODO items include fixing the CSV results to return the currently toggle result set, adding support for multiple graphs when applicable, adding a way to link to a specific result set, and possibly changing the UI for switching between them.

[NickCraver]

Looks good, it's a pretty large changeset though - I'll let this cook on the internal SEDE instances for a day or two before building out data.SE.

[tms]

Sounds like a good idea. I've been trying to keep the changesets reasonably sized, but this ended up being an exception.