used to return "" and not bool(false). It's not worth keeping it because
STR_FREE() and zval_dtor() always have to check for it and it slows down
the general case. In addition, it seems that empty_string has been abused
quite a lot, and was used not only for setting zval's but generally in
PHP code instead of "", which wasn't the intention. Last but not least,
nuking empty_string should improve stability as I doubt every place
correctly checked if they are not mistakenly erealloc()'ing it or
calling efree() on it.
NOTE: Some code is probably broken. Each extension maintainer should
check and see that my changes are OK. Also, I haven't had time to touch
PECL yet. Will try and do it tomorrow.
i nuked all unneded calls to php_header() - i'm not too sure how we do
handle HEAD Requests as they were only detected via php_header(). but calling
php_header from a module makes output-buffering unusable.
NOTICE: there is some EBSDIC stuff in gd.c - i think it's obsolete.
