Variadic macro as printf - so we can use php_printf
when this is used with the extension
make php_printf the default printer when compiled into PHP
initial cleanup of public api methods for stumblecache
clone test that was somehow missed in earlier commits
Part 3 of code cleanup
mainly in btree.c
error handling, code organization
commenting, error checking, some small api adjustments
stumblecache changes are mainly to work with newer stuff
in btree and are not yet complete