refactorizations in PEAR::DB drivers

I have a few changes in DB which I'd like to solicit some comments on. There's an awful lot of code duplication in PEAR::DB drivers... You can see the files at http://roman.bellavista.biz/PEAR-DB/ * PEAR-DB-r1-8.patch cumulative patch with log messages for individual revisions * PEAR-DB-r{2..8}.patch individual revisions plus their log messages Please note that the diff has many sharp edges as I can only make sure the code passes lint with most drivers. BTW, the patch is based on the tree as of Friday. -- If you cc me or remove the list(s) completely I'll most likely ignore your message. see http://www.eyrie.org./~eagle/faqs/questions.html