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Fix default constructor of IntegralRangeInterator

Carsten Gräser requested to merge feature/fix-integralrangeiterator-default-constructor into master

In c++-14 all value-initilized forward iterators should behave like the end-iterator of a hypothetic empty container and furthermore should all compare equal. Here, this would lead to undefined behaviour since the value_ member is not initialized.

To avoid this we no initilize it by 0 which mimics 'past end of empty range'. With this patch we can check IntegralRangeInterator using the testConstIterator() test suite.

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