Always check iterator size when allocating #1394
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Andlon
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Fixes #1391.
Allocation now checks whether the supplied iterator has the correct size. Because checking this size messes with the zero-cost conversion of a
Vecto aMatrix, I have also added a methodallocate_from_vecto theAllocatortrait with a default implementation. I am not sure if this will be useful in general. Alternatively this could also just be a private method ofDefaultAllocatorinstead.