fix transfer of large data

[derekwisong]

Data larger than the max integer value would fail to transfer. changed
size of message read from the IPC protocol from an int to an unsigned
int. Also changed to load large data in chunks since stream.read() does
not support values larger than max int.

[bartosz-dolecki]

Thank you for contributing code to the the Exxeleron GmbH open source projects! Before we can merge the changes you propose we need a contributor license agreement from you.

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Exxeleron team

[nugend]

I think in Python 3, sys.maxsize is the appropriate limit for the representation. See here: http://stackoverflow.com/questions/13795758/what-is-sys-maxint-in-python-3

Actually, sys.maxsize might be appropriate for both Python 2 and 3?

[mkujbus]

why is this not get merged?

[nugend]

@mkujbus this repo has been abandoned. There is no public effort to maintain the qpython library, unfortunately.