= TODO
---
* adjust_timeline method
* ri_check for specificy tuples


---
* possibly re-implement in C for speed -- ouch.
* BtPgView class would be handy
* scripts which can automatically generate require schema description by
  parsing something like

    create bitemporal table bt
      (
	bid int,
	data text
      
	primary key (bid)
      );
* write about a million more docs
* write more (yes more) unit tests
* rework seq_insert to take pa_begin and pa_end - rethink this...