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, and ATTESTATION
files.  Remove Scripts directory and INSTALL file left from the
VistA-FOIA repository development workflow.  The VistA-M components will
be maintained using infrastructure in the OSEHRA VistA.git repository.