SERVER-10471 Clone tag correctly in RelevantTag::clone()
SERVER-10532 batch write executor and unit tests
SERVER-10471 fix test to deal w/new interval comparison state
SERVER-6405: ExtentManager no longer has access to collection internals
             attachment of Extent to collection is done in Collection
SERVER-9248 Ignore errors when checking readahead

To test, run sudo chmod o-x /sys/dev/block
SERVER-10795 clean up V8Scope if exception thrown in constructor
SERVER-10471 Report min/maxKey properly; ditto reverse index scans
SERVER-1891 add new ActionTypes
Revert "SERVER-6405: ExtentManager no longer has access to collection internals"

This reverts commit 9cbdc4fa38c14a27213189d137fd6a3f3e2d3c63, which breaks
at least smoke auth and smoke sharding.
SERVER-10927 RS hosts drop temp collections on promotion to master

Non-replicated hosts still drop temp collections on startup. This is
inappropriate for replica set members (and pure slaves) since it can lead to
discrepancies between hosts.
SERVER-6140 Add a basic sharded agg explain test
Revert "Revert "SERVER-6405: ExtentManager no longer has access to collection internals""

This reverts commit cbe5d8c77986e940f3bb5fccf7c63732b9b0e907.
SERVER-6405: fix configsvr database check inversion
SERVER-6405 SERVER-11073: FlatIterator shouldn't fail if collection has no extents
SERVER-6405: rename CollectionTemp to Collection
SERVER-6405: fix Database Collection cache when an index fails to build