Allow facets in multi-valued objects and other improvements

[Cito]

The PR contains these fixes and improvements:

• allow facets in multi-valued objects and test this
  • currently only works when the field is directly inside that object
• always return the facet options sorted by value
• do not change the config in place when the ID is missing as selected field
  • this caused the response of search-options to change after the first query
• replace dots with blanks when auto creating names from keys (so "study.title" becomes "Study Title" now)
• more than double the test speed by reusing state

[coveralls]

Pull Request Test Coverage Report for Build 10276236005

Details

• 5 of 5 (100.0%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.04%) to 90.234%

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Totals
Change from base Build 10263314868:	-0.04%
Covered Lines:	462
Relevant Lines:	512

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💛 - Coveralls

[TheByronHimes]

Nicely done