all test indexing to skip sleeping

this makes the tests run in 10% of the time!
allow for empty MANIFOUND

This happens in some cases where we decide to skip before
we unpack the dist.
add a new means to say "skip indexing, but say so"
allow extra callbacks to testing emails
test that we do not index whenrelease_status ne stable
do not index dists where release_status is not stable
send skip reports on release_status ne stable
Merge branch 'pr/90'