Add join() function#82

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zilder wants to merge 3 commits into

Commits on Feb 13, 2019

add function mjoin to allow to join a variadic number of istores
zilder
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Rename mjoin to join, format the code a bit, minor fix (there was more memory for pairs array allocated than actually needed)
zilder
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Remove redundant CreateTupleDescCopy()
zilder
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