Reimplement SeqGS as an alias of SeqSOR

Oliver Sanderrequested to merge
remove-separate-gs-implementation into master

SeqGS is really just a reimplementation of SeqSOR, without the ability to change the loop direction. In order to make this clearer and to save a few dozen lines of code the patch reimplements SeqGS as an alias of SeqSOR.

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