Removed all stuff for extension versions < php4.1
Consistency in error messages
Better error messages and Zend/PHP extension mismatch detection
Use of zend_error() instead of stderr
Typos
Better error messages
Merged krakjoe's PR
Removed debug messages
Merge branch 'extensions_improvements' of https://github.com/jpauli/php-src into extensions_improvements

Conflicts:
	Zend/zend_API.c
	Zend/zend_extensions.c
	ext/standard/dl.c