Support for subscript adverb :delete in combination with :kv :p :k :v

As described in S02:2514
Merge remote-tracking branch 'upstream/nom' into deleteadverbkvpkv

Conflicts:
	src/core/Any.pm
We don't need no Mu

After discussing this with jnthn at PLPW
Merge pull request #158 from lizmat/deleteadverbkvpkv

Support for subscript adverb :delete in combination with :kv :p :k :v