Fix potential remote console memory leak
Enhanced Remote Console support to allow two separate command processing modes.

 1) Single Command Mode:  commands are processed between simulated instructions once CR is received.
 2) Multiple Command Mode: commands are initiated with the WRU character (usually *E) which suspends simulation execution and commands are processed until a CONTINUE command is entered (or automatically provided if the SET REMOTE TIMEOUT=seconds interval has elapsed).
Avoid noisy log messages in Remote Console activities.
Merge branch 'master' of git://github.com/simh/simh into BlinkenLights