pause immunization documentation to refactor master.
I hate HL7.  Mid immunizations commit.
draft of immunizations created.
Merge branch 'master' into matt-immunizations
incremental commit for main-merge.
Merge branch 'master' into matt-immunizations

Conflicts:
	docs/model.md
reconcile merge conflict in documentation.
Immunizations done, untested.
incremental commit.
better immunization testing.
Merge branch 'master' into matt-immunizations

Conflicts:
	docs/model.md
Revised merge conflicts.
Merge branch 'matt-immunizations'
working demographics.