Some sess doc stuff

• Load

sessdocget id[/rev] > entity ""=httprc

sessdocget id[/rev] --nohead > body ::=httprc

sessdochead id[/rev] < head ::=httprc

• Store (author, if not specified, will be ~/.sessdoc[AUTHOR], or userid on localhost)

sessdocput id[/rev] < entity ::=httprc

sessdocput id[/rev] --type=content-type --title=content-title [--author=author] < body ::=httprc

sessdocbranch id[/rev] new-id [--author=author] ::=httprc