Fix regex for META6.json check, also strip unneeded variable
improve alignment of underbars in index report
we need to set the changed URIREORD/uriid

Because we inject the Perl6 directory in uriid and several subs regenerate the
path of the tarball using MLROOT/uriid, we need to update uriid globalish.
fix quoting bug
log the system error message on failure
correct some test names, add a few more tests
mkpath Perl6 directory and any additional sub directories
do not run s/// on undef