Implement -j for cvs diff, allowing tag:date based diffs (normally date-based diffs are against the head branch only).
Implement -j for cvs diff, allowing tag:date based diffs (normally date-based
diffs are against the head branch only).

MFC after:	1 week

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase