Datatest

------------------

* Changed DataQuery select behavior to fail immediately when invalid syntax is
used (rather than later when attempting to execute the query).
* Changed error messages to better explain what went wrong.

------------------

* Added a single, smarter assertValid() method.
* Removed old assertion methods.
* Added query optimization and a simpler and more expressive syntax.
* Changed allowances and errors to be more expressive.
* Added basic composability to some allowance classes using "&" and "|"
bit-wise operators.

-----------------------

* Removed some of the internal magic and renames data assertions to more
clearly indicate their intended use.
* Changed data allowances to provide more consistent parameters and more
flexible usage.
* Added new method to assert unique values.
* Added full **fmtparams support for CSV handling.
* Fixed comparison and allowance behavior for None vs. zero.

-----------------------

* First public release of rewritten code base.


Changelog Guidelines
====================

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