refactor for multiple choice facets
move facetbrowser code to own file
add acquisitionInformationTerms field
code cleanup
Merge branch 'develop' into feature/152_facetbrowser_multiple_choice
Merge branch 'feature/152_facetbrowser_multiple_choice' into develop
Merge branch 'develop' into feature/1473-acquisitionInformationTerms
Merge branch 'feature/1473-acquisitionInformationTerms' into develop
Merge branch 'develop' into feature/1508-order_button