Rewrite Zmodem using state machine and avoiding static variables

Write janus, hydra?

Support BSD terminal control

Make system status files (last call, retries etc)

Optionally create .bsy files

Check available space when receiving

Check if there is mail before calling

Consider "magic" names with file lists rather than executables

Option to generate a gatewayed "reply-to" with a fixed domain

Send some responce if requested file [not] found

Create different ^aMSGID-s for crossposted messages

Lock if[un]pack against simultaneous execution

Avoid duplicate remote addresses on WaZOO and FTS outbound sessions
