Use less amazing keys to avoid double-caching things(?)
Shard out LMDB namespaces into distinct DBs
v2.020005

 [Bugfix]
 - dep_changes.pl: Use a flattened key value because the previous release started segv-ing and eating all my ram
   shortly after release.

 [Utils]
 - dep_changes.pl: Shard out LMDB namespaces to distinct DBs till I can work out a better way to see wtf is going on
   inside them.
post-release cleanup