Enable LMDB Backend
make chi code make more sense
Dont cache non-versioned tags
Be more graceful about releases branch being missing
Increase cache size to 7d
Update autochange
v2.020002

 [Dependencies::Stats]
 - Dependencies changed since 2.020001, see misc/*.deps* for details
 - develop: ↑8
 - runtime: ↑10
 - test: ↑2

 [Utils]
 - dep_changes: Enable LMDB Backend as an option.
 - dep_changes: Cleanup CHI code to be more efficient and understandable.
 - dep_changes: Be more graceful about 'releases' branch being missing.
post-release cleanup