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'
Update model.md
working demographics.
fixes pre race-ethnicity reconcile.
Revert "fixes pre race-ethnicity reconcile."

This reverts commit 7bf9f80b247e2ebe69907ff9499aecea129c14d2.
Revert "fixes pre race-ethnicity reconcile."

This reverts commit 7bf9f80b247e2ebe69907ff9499aecea129c14d2.
Revert "Revert "fixes pre race-ethnicity reconcile.""

This reverts commit c1200a3a08123a8ce46692a9a4b851d647f154d9.
Race Ethnicity Collapse.