Candidate Search - refinements v3

Further from:

* #1389 - Candidate Search / Reanalysis
* #1390 - refinements

Improvements

* Add documentation
* Be able to give it a name
* popmax stuff should take into account eg compound het etc
* Candidate grid - be able to expand to see reviewer/comment (which I removed from grid)
* Some kind of score to distinguish low hanging fruit from marginal ones?
* Perhaps a score how shifting UP or Down pathogenicity?
* We could probably assign a user who would like to know? Ie owner of classification, or analysis or uploader of sample etc?
* As you perform processing of samples/results - could update run with stats so people know how far along it is
* Quick count of how many pathogenic variants are in ClinVar vs various ones
* Evidence update - check whether clinvar is empty?
* Evidence update - isn’t comparing across annotation versions -
* Form - candidate class updates - re-arrange order and selectively hide stuff after toggles
* Display on the various pages - if user settings visibility
* Should users get messages?
* Classification for candidate - should be able to hide the “my sample isn’t here” option (as already set)