* Moved perforated distance filter to private packages

* Fixed bug in object order by unique ID
* Fixed bug with when null parameters are passed to AlgorithmStorageBucket, VirtualStorageBucket and DiskStorage
* Fixed bulk insert operation's annotation to support single argument correctly
* Forced statistic computations for lower/upper bounds on metric function
* Added support of passing file names to external extractors
* Added support for binary serialization of string objects
* Documentation fixes
* Cleanup of attributes/constructor/access method