set it to a value that should indicate that the opcode is unknown, and
also indicates what the value is. (Especially don't do it without
calling check_col() to check whether we *should* change the info column,
as we'll dereference a null pointer if we shouldn't; this change should
fix bug 489.)
svn path=/trunk/; revision=16038
Also move ncp222.py, x11-fields, process-x11-fields.pl,
make-reg-dotc, and make-reg-dotc.py.
Adjust #include lines in files that include packet-*.h
files.
svn path=/trunk/; revision=11410
