Only test stuff if PDO is enabled

Update for pending PEAR release.

symlinked pdo drivers under ext.
Enabled PDO and PDO_SQLITE by default.
Fixup PDO header detection so that it searches in the correct order, and
correctly picks up the headers when buildi

symlinked pdo drivers under ext.
Enabled PDO and PDO_SQLITE by default.
Fixup PDO header detection so that it searches in the correct order, and
correctly picks up the headers when building from outside of the source
tree.

TODO: make pdo_XXX auto-enable when XXX is enabled. Volunteers welcome.

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try to handle OSX issues more gracefully

update ready for release
# includes big hack to help guide people into running "make install" so
# that the headers get installed; works around a pear bug.

better handling of pdo-level errors

implement SQLSTATE style error codes.
Allow drivers to add methods to dbh and stmt objects
(note that we can't use a class, because the use only sees the PDO class).
Clarify the api sligh

implement SQLSTATE style error codes.
Allow drivers to add methods to dbh and stmt objects
(note that we can't use a class, because the use only sees the PDO class).
Clarify the api slightly:
PDO::exec() is used for one-shot queries that don't return rows
PDO::query() is a convenience function for returning a rowset without
having to go through the steps of preparing and executing.

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Cosmetics

handle binding/quoting of queries for drivers with emulated prepares

Allow PDO to build as a self-contained extension.
Install headers so that other self-contained extensions may them.

Hello PDO.

Still more to come. Give it a couple of days before starting to write drivers
for the other databases; a few things might change, so I'd like to coordinate
that, but in a

Hello PDO.

Still more to come. Give it a couple of days before starting to write drivers
for the other databases; a few things might change, so I'd like to coordinate
that, but in a couple of days.

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