[development] PDO and database limitations

[Chris Johnson]

Option A.  Go for it, I say.

Maybe we need to form a database team?  In addition to PDO support, there's
the referential integrity and transactions which David described.
Additionally, just general database optimization and configuration
recommendations could be described.  Killes did a lot of work on making
drupal.org work better.

While there's room in the PHP code for performance improvements, probably
some of the biggest and easiest to obtain are in the database.

It'd be nice to have a couple of database layers to choose from, so as to
support the widest variety of installations.  That is, for example, a layer
which supports PHP 4 and MyISAM, for small sites on cheap hosts, to a layer
which supports PDO and transactional engines only (no MyISAM) for
high-performance sites on high-end hardware.
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