License update

Ok, so we do have to lock in there

More locking work

Step 1 in nuking the garbage collector:
- Change the hash destructor to return int
- Don't kill the bucket on hash_destroy if the destructor returns 0

* Support recoverable failure from erealloc()
* Fix the shutdown code on an unrecoverable erealloc() failure

Add zend_hash_get_current_key_type()

Support overwrite mode in zend_hash_merge()

* Fix all hash checks that checked Bucket.arKey for NULL, when it was changed
to char[1], these checks should have been changed to Bucket.nKeyLength==0
* Support runtime declaration of func

* Fix all hash checks that checked Bucket.arKey for NULL, when it was changed
to char[1], these checks should have been changed to Bucket.nKeyLength==0
* Support runtime declaration of functions. I ended up changing the grammar
to catch top level functions vs. nested functions. The reason is simple -
if we don't have functions properly declared at compile-time, function calls
cannot be resolved at compile time, and have to be resolved at runtime, which
ends up being much much slower (without the optimizer, that is).
It's no biggy though, the grammar change isn't that bad.

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Zend Library