DDCMP: Reordered fields written in debug output for easier reading and fixed ddcmp_build_nak_packet to insert the flags value into the constructed packet.
TMXR: separate RTS from DTR when manipulating modem state bits
DMC: Fix DDCMP reset logic to properly clear and resend (later) pending transmits when the link state goes down.  Enable piggy-back ACKs when possible.