* Make handling of SplFixedArray properties more consistent
Create a brand new reference counted array every time in SplFixedArray
to be freed by the callers (or return null).
Switch from overriding `get_properties` to overriding `get_properties_for` handler
* Print objects with null hash table like others in print_r
Noticed when working on subsequent commits for SplFixedArray.
Make whether zend_get_properties_for returns null or an empty array
invisible to the end user - it would be always be a non-null array for
user-defined classes.
Always print newlines with `\n\s*(\n\s*)` after objects
Noticed when working on SplFixedArray changes, e.g. in
ext/spl/tests/SplFixedArray__construct_param_null.phpt
a) Fix uses of zend_string in error message
b) Don't assign the overloaded object as the backing storage, that
sort of defeats the point. Instead leave the previous value.
