TMXR: Be sure to correctly allocate the appropriate sized line transmit and receive buffers when a mux or line is attached.
PDP11, PDP10, VAX: Start device connection polling on device reset when any units are attached
SCP: Added generic output routine sim_printf to output to stdout and sim_log (and sim_deb when enabled)

The goals here being to simplify calling code while getting consistent output delivered everywhere it may be useful.

Modified most places which explicitly used sim_log or merely called printf to now avoid doing that and merely call sim_printf().
Compiler suggested cleanups