When not in Telnet Binary TX mode, expand bare CR received from COM to CRLF

I can't believe I missed this - this would've caused definite issues with file
transfers.

I saw a discussion in FSX MYS (between apam and GEARBOX)  which clued me into
their being an issue here. I do wish users of SexPOTS would report issues to
me. :-(

Incremented version to v2.1