Rename OSEHRA VistA-FOIA to OSEHRA VistA-M

The history behind this commit was originally developed in a separate
VistA-FOIA repository.  It was filtered to remove non-M components from
the source tree history.  This source tree holds VistA M components,
FOIA or otherwise, so use a more generic name.

Prepare to publish this history in a new OSEHRA "VistA-M" repository.
Update the project name in the README.rst, NOTICE, INSTALL, and
ATTESTATION files.  Update the wording in Scripts/HowtoUpdateVistA.txt
to distinguish the VistA-M source tree from VA FOIA VistA.  Remove local
Git setup scripts left from VistA-FOIA repository development.