First version of save function + unit tests

Finished first version of qim3d.io.save() + unit tests. I am not sure what self.verbose is intended to do, so for the moment, I have just left it unused in init()

requested review from @fima

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• 03ca856e - Updated docstring

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• bcbde260 - Fixed issue of not being able to save to current dir

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• 69eb58b3 - removed verbose attribute

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• 90faf88e - Added 'lossless' in docstring

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merged

mentioned in commit 493453ea