SCP: One more static analyzer potential issue from Peter Schorn.
ETHER: Fix mixed line endings which crept in while adding network support without any pcap components.
SWTP: Fixed overflown bit logic for addition and subtraction (from Bill Beech)
ETHER: Added support to build with more older versions of libpcap on some platforms.  Removed support to use tcpdump.org's libpcap on Linux platforms.
MAKE: Changed minimum version of gmake required before warning is issued from 3.81 to 3.80.
I1620 : Changes from Bob Supnik re: Bob Armstrong has been running diagnostics and software, and these changes reflect fixes to bugs that were found.

We're not absolutely sure that all of the changes are correct - in particular the treatment of record marks in add/compare - but they do make the diagnostics pass, which they didn't before.

Bob asked for variable tab stops on the typewriter, and those are implemented as well. The routines were general enough that I put the SET/SHOW processors in sim_console.c, so I'm enclosing that and its header file.

Conflicts:
	I1620/i1620_cpu.c
	sim_console.c
	sim_console.h