A little bit of clean up (!1222) · Merge requests · Podhorszki, Norbert / ADIOS2 · GitLab

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Podhorszki, Norbert requested to merge github/fork/germasch/cleanup into master Feb 22, 2019

Created by: germasch

This one is hopefully not so controversial:

Use DataMapEntry instead of std::pair to make the code more readable.
do a bit of header cleanup
remove one left over IOType mapping bit which is not necessary anymoe