SCP: Add the # character at the beginning of a line as a comment character.  Requested by Kevin Handy
TMXR, SOCK: Properly declare as const string input only arguments.
SCP: Fix potential infinite loop when EOF is encountered on stdin for hosts using BSDTTY tty I/O.
Merge remote-tracking branch 'upstream/master'
Simplify operand decode.

Operand decoding now no longer attepts to compute effective addresses
or fetch data. The operand struct is simply a container for a
decomposed operand from the byte stream, and will be used by
read/write routines during instruction execution.