Partial reversion of "fix bad package name"

This reverts bits of commit 203e07a4c20eacbcad8ea72ea5a356f3612fef8e
in order to reinstate Heavy functionality, while also fixing misleading
'provides' metadata.

Conflicts:
	lib/Hash/Util/FieldHash/Compat/Heavy.pm
new test to confirm the Heavy compat layer actually works
fix misspelled config
Hash-Util-FieldHash-Compat-0.06

        - fix misleading 'provides' metadata (added in 0.05) that may confuse
          some tools