Implement ReflectionFunction::inNamespace()
Implement ReflectionFunction::getExtension[Name]()
These functions are implemented in a skeletal way and will always
return NULL (or FALSE - anyways, as if there were no extension).
This way, we at least no longer get fatal errors though...
Implement ReflectionFunction::isDeprecated()
Always returns FALSE at the moment
This way, we at least no longer get fatal errors though