Clean this puppy up quite a bit.  Most notably:
Clean this puppy up quite a bit.  Most notably:

1. Use ${MAKE} everywhere again.  Whoops.
2. Replace multiple invocations of gzip ... split ... with one variable.
3. Add src-clean target for making the src tree presentable before
   making a src tarball out of it.

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