* Using $BASEDIR to pass the location of the repo hasn't worked for a
while. It has been removed. Simply cd into the vcs repo before
running a command.
BUG FIXES:
* .gitignore was being created in subdirectories instead of VCS root.
MINOR CHANGES
* _blackbox_common.sh: Replace change_to_root with change_to_vcs_root
* confidence_test.sh: Added more assertions and tests.