Combine Search and extract.

Combines the two features, making them consistent with one another.
Establishes a convention of warning as a primary button, info as a secondary button.
Starts to use warning panel headers.

Uses discharge/admission in results

refs openhealthcare/elcid#340
refs openhealthcare/elcid#326
refs openhealthcare/elcid#319
refs openhealthcare/elcid#323
Extract: nullify value when column is changed

refs openhealthcare/elcid#353
Some styling changes, WIP

Refs openhealthcare/elcid#323
Merge pull request #232 from openhealthcare/323-combine-search-extract

Combine Search and extract v2