remove the save/load requests

They have been stubbed out as no-ops for more than two years now.
Per mailing list email, they don't compile either (unable to cast
ASR request to bool).  Rather than wasting time debugging, just
remove them.
Merge pull request #217 from linas/master

remove the save/load requests
Merge branch 'master' of https://github.com/opencog/opencog