Rewrite hl7 messages - #56

Draft

tomunger wants to merge 7 commits into

johnpaulett:mainfrom

tomunger:rewrite-hl7

Commits on Feb 27, 2023

Remove relative imports from tests.
tomunger
committed
56eb284
Rewrite HL7 fields with new structure.
tomunger
committed
33a133f

Commits on Mar 9, 2023

Add write_field() to Message and Segment. Writes an
tomunger
committed
6a7e035

Commits on Apr 10, 2023