got 0.81

- gotd: print configuration errors without -d (op)
- gotd: move nrepos check to parse_config (op)
- gotd: move socket path check to parse.y and error from the main process (op)
- fix an issue where multiple ref-updates are rejected by gotd
- fix an issue where gotd fails to accept multiple have-lines from clients
- regress: replace typeset with printf for shell portability (naddy)
- fix spurious "gotsh: unexpected flush packet" error when client is up-to-date
- gotd: fix "bad packfile with zero objects" error while creating branches
- document the gotd -n option