Add getter to iterators to obtain the position they are pointing to

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Currently, some pointer arithmetic is required to get the physical position an 
iterator is pointing to and do some calculations inside containers. This is 
both a readability problem and a performance problem. They could be solved just 
by adding a getter, GetInternalPosition, to every existing iterator.

This task includes the adaptation of all the containers to use this getter 
instead of doing manual calculations.

Original issue reported on code.google.com by Lince3D@gmail.com on 27 Jan 2015 at 12:55

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Original comment by Lince3D@gmail.com on 28 Jan 2015 at 8:48

• Changed state: Started

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Original comment by Lince3D@gmail.com on 28 Jan 2015 at 9:25

• Changed state: Done