new outbound interface:

supported outbounds:
- Binkley Domain
- new FD
- perhaps arcmail attach
- T-Mail fileboxes

interface:
- CheckBusy, SetBusy, UnSetBusy
- SendFile, CheckFileSent
- ArchiveName (BT: in outbound, TMail: in filebox, FD: subdirs in TicDir)
- PurgeArchs (remove archives with zero length)

