use None instead of study_subject_columns to force the columns to be visible. use yes_no_null_inconclusive_filter instead of yes_no_null_filter. add virus_test_date for width hack in smash.js,. Change column names so that they start in 0 and they refer to RT-PCR

- See visit details
- Add appointment to visit
- See appointment types of visit
- Different status tooltips to better describe the status.
- Better format of the date and full date on hover.

Changed function so the reminder is sorted as well. If no filter is provided then the reminder is all the screening number and it will be sorted with the provided order. Changed tests and the test screening numbers.

Issue #207 . Added custom sorting for screening field in study subject based on the filter introduced in the column. Multivalues are re-sorted

visit is marked as exceeded when time of the visit is exceeded and there are no scheduled appointments, when there are scheduled appointments it's marked as in progress

there is possibility to define columsn that are not sortable