Copy cache hits to the local cache, since the local cache is a lot faster than the rest.
Add 2 options: cache-local-object-max, cache-local-compression.  object-max is 16k by default and compression is 'zlib' by default.
Release 1.6.0b1
Fix zodburi reference in README
Speed up packing using cursor.fetchmany().
Merge remote-tracking branch 'upstream/master'