update testing imports for issue 768
add minimal types
better fix for test dependencies
change jsconfig.json includes, update packages, change swingset test (#3300)
update committeeRegistrar for relocation of voterFacet
integrate with changes to ballot PR (3233)

make ballotCounter instance accessible from ballot
add more to terms of ballotCounter (closureRule)
add more to public facet of Registrar
one registrar per contract/vat: details in terms
use zcf.getInstance() to supply instances

In tests
  voters look up their own positions
  voters cast ballots on notification

I want the Treasury changes to be on top of the registrar (#3299)
which is still in review. Git/GitHub doesn't allow an empty PR to be
rebased onto anther PR, so this adds a commit..