Python-application

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* Added usage example for the decorator module.

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* Added application.python submodule. It contains python related utilities
and helpers (currently it contains the decorator and util modules).
* Added decorator support in application.python.decorator.
* Moved the Singleton and Null classes from application.util to
application.python.util.
* Updated years in copyright info.

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* Fixed issue with printing the memory dump in multi threaded environments.
* Ignore one time collectable garbage generated before the memory debug
module is imported.