SERVER-13645 eliminate is_master.h
SERVER-14274 SERVER-14135 implement awaitReplication() in LegacyReplicationCoordinator
SERVER-14275 SERVER-14135 implement setLastOptime() in LegacyReplicationCoordinator
SERVER-14312 fix a failure mode of reconfig.js
SERVER-14308 eliminate majority.js
SERVER-14135 implement processReplSetGetStatus() in LegacyReplicationCoordinator
SERVER-13635 IndexAccessMethods now take a BtreeInterface rather than a RecordStore
Revert "SERVER-13635 IndexAccessMethods now take a BtreeInterface rather than a RecordStore"

This reverts commit 98a0c6f7c2a91d28a1f48c8fb0805e6745f0e8f9.
SERVER-13635 IndexAccessMethods now take a BtreeInterface rather than a RecordStore
SERVER-1153: head record store update now works
SERVER-13635: fix BtreeInterface change by removing dead variable
SERVER-13635: clean up ownership semantics of objects inside of StorageEngine
SERVER-14312 ensure node 0 will be primary as part of the reconfig.js fix
SERVER-14006 Experimental document-level locking for in-place updates

This commit enables experimental (and untested) document-level locking for
in-place updates, which do not modify indexed values.

It should absolutely not be used on production systems and is for
demonstration purposes only.

It runs under server parameter called useExperimentalDocLocking. In order
to enable it, run:

./mongod <other parameters> --setParameter useExperimentalDocLocking=true
SERVER-13635 Replaces high-level references to Record  with RecordData class.

In order to allow the use of certain types of storage engines, it was
necessary to replace some use of the Record class. The Record class is
now almost entirely restricted to the mmapV1 level and below.
Higher-level uses of the Record class were replaced with calls to the
new RecordData class.
SERVER-13635 Implement Heap1BtreeImpl as an alternative to Btree in HeapRecordStore
SERVER-13635 Undo change to BtreeCursor save/restore

A more complete patch is coming soon
SERVER-13635 Clean up BtreeCursor save/restore.

It is now up to the BtreeInterface impl to decide what data it needs to save.
Save and restore must *always* be called before/after a yield if you intend
to use the cursor again, even if it is at EOF.
SERVER-13635 Capped HeapRecordStore fixes
copied files over from branch