Adds functionality to remove missing codes from CRF data
Fixes sleepepi/bestair-data-dictionary#17
Fixes sleepepi/bestair-data-dictionary#49
Fixes sleepepi/bestair-data-dictionary#59
Fixes sleepepi/bestair-data-dictionary#13
Fixes sleepepi/bestair-data-dictionary#55
Fixes sleepepi/bestair-data-dictionary#52
Fixes sleepepi/bestair-data-dictionary#50
Fixes sleepepi/bestair-data-dictionary#44
Fixes sleepepi/bestair-data-dictionary#43
Fixes sleepepi/bestair-data-dictionary#42
Fixes sleepepi/bestair-data-dictionary#41
Fixes sleepepi/bestair-data-dictionary#40
Fixes sleepepi/bestair-data-dictionary#36
Fixes sleepepi/bestair-data-dictionary#16