Preparations for positional/associative delegate.

This work will eliminate some of the v-table use that is in the way of
certain bits of porting work, but should also provide some other wins.
Get KnowHOW bootstrap using REPR compose protocol.
Fix a test that used KnowHOW incorrectly.
Fix another bad use of KnowHOW.
Fix an op that failed to compose a package.

The op overall needs to go away as it's something of a hack, but easier
to just fix it up for now.
Finish removal of pre-REPR-compose code.