package: remove a lot more unused AT&T cruft

This reduces the bin/package script by more than half!

bin/package, src/cmd/INIT/package.sh:
- Remove obsolete and unused package commands: admin, contents,
  license, list, remote, regress, setup, update, verify, write.
- Remove associated documentation.
- Replace install command with a dummy. It'll come back when we
  reintroduce the building of dynamic libaries.
- Update the test command to run the regression tests properly
  and capture the output in arch/*/lib/package/gen/tests.out, as
  documented. Arguments are simply passed to bin/shtests.

src/cmd/INIT/{ditto.sh,hurl.sh,release.c}:
- Removed. These were support scripts for some of the removed
  package commands.

src/cmd/ksh93/tests/pty.sh:
- Avoid failure when capturing output via 'bin/package test' by
  redirecting standard error to /dev/tty when running the tests.

src/cmd/ksh93/tests/pty.sh

@@ -45,7 +45,7 @@ esac
 # To avoid false regressions, we have to set 'erase' and 'kill' on the real terminal.
 if	test -t 0 2>/dev/null </dev/tty && stty_restore=$(stty -g </dev/tty)
 then	trap 'stty "$stty_restore" </dev/tty' EXIT  # note: on ksh, the EXIT trap is also triggered for termination due to a signal
-	stty erase ^H kill ^X
+	stty erase ^H kill ^X </dev/tty >/dev/tty 2>&1
 else	warning "cannot set tty state -- tests skipped"
 	exit 0
 fi
@@ -75,7 +75,7 @@ function tst
 	integer lineno=$1 offset
 	typeset text
 
-	pty $debug --dialogue --messages='/dev/fd/1' $SHELL |
+	pty $debug --dialogue --messages='/dev/fd/1' 2>/dev/tty $SHELL |
 	while	read -r text
 	do	if	[[ $text == *debug* ]]
 		then	print -u2 -r -- "$text"