- Fix blackbox commands so that they work when called with absolute paths.

- Fix confidence_test.sh so that it's not hardcoded to a specific dev environment path.

bin/blackbox_edit

@@ -4,7 +4,8 @@
 # blackbox_edit.sh -- Decrypt a file temporarily for edition, then re-encrypts it again
 #
 set -e
-. _blackbox_common.sh
+blackbox_home=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
+source ${blackbox_home}/_blackbox_common.sh
 
 for param in """$@""" ; do
   unencrypted_file=$(get_unencrypted_filename "$param")