api sub support to functional only data sub and new VUS terms

Functional_data prototype

Submission API schema to support somatic variants release

somatic submissions in apitest mode

Submission API somatic variant support plan.

Date announcement

Add new variant web page UI snapshots

Update to proposed release time.

Addition of new tab delimited sample files and info.

 Updated typos in xsd diff and error in submission templates

Minor updates to documentation related to formatting and a typo