Made do_flush_txn be static.
Made flushing awkwardly cascade to subsequent page transactions.
Made the alt cache block_writes call receive a real callback and use it rather acceptably.
Removed outdated RSI commment about making a function static.
Replaced C++11 initialization syntax for begin_waiting_for_flush_.
Removed some more bad RSI comments.
Removal of last modifier statuses of a transaction before pulsing flush_complete_cond_.
Added basic CreateDestroy page_cache_t test.
Added OneTxn test, made page cache handle degenerate txn case, made data_block_manager_t handle degenerate many_writes case properly.
Added PageTest.TwoTxn.
Added PageTest.TwoIndependentTxnSwitch.