ADC "rmrepo" replaced by "rm" and "trash", with helper ADCs

helpers for 'rm': lock, unlock
helpers for 'trash': list-trash, undelete

common functions updated with local settings for ADCs as well

contrib/adc/lock

@@ -0,0 +1,12 @@
+#!/bin/sh
+
+. $(dirname $0)/adc.common-functions
+
+# this is a helper ADC for "rm"; see that one for documentation
+
+# cd to repo base and make sure arg1 is a valid repo (also sets $repo)
+valid_owned_repo $1
+
+rm -f $repo.git/gl-rm-ok
+
+echo "$repo has been locked"