4.4BSD snapshot (revision 8.1); add 1993 to copyright

update from Rodney Ruddock for 4.4BSD; bug fixes, plus reworking
of the bang command to permit sh scripts from within ed, a la SunOS

some lint, some bug fixes, ^C handling improvements
multiple access methods back in (yeeech!)
new version from Rodney Ruddock (rodney@snowhite.cis.uoguelph.ca)

reformat to KNF, prototype the world, fix lint bugs

date and time created 93/01/23 11:13:17 by bostic