we have the entire instruction, so no need to do read-modify-write when resetting breakpoints

use definitions in <ptrace.h>

no longer strips first char of arguments to :r command

fix sccs keyword lines

Changes per David Mosher: allow space and tab around '<' and '>' on
output redirection specification when starting a process up.

date and time created 81/05/14 15:19:57 by root