SERVER-8790 Move QueryPlanSelectionPolicy to a new file.
SERVER-8790 Move QueryPlanSummary to a new file.
SERVER-8790 Move QueryPlan to a new file.
SERVER-8790 Rename queryoptimizer to query_optimizer_internal.
SERVER-8790 Move NamespaceDetailsTransient::getCursor() and NamespaceDetailsTransient::bestGuessCursor() to getOptimizedCursor and getBestGuessCursor.
SERVER-7159 Unit tests for record size quantization and record allocation.
SERVER-4940 Update the repl16 test so it will trigger the appropriate behavior in the current mongo shell.
SERVER-5848 Additional tests.