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Bp4 fix streaming issue

Podhorszki, Norbert requested to merge github/fork/pnorbert/bp4-fix-streaming into master

Created by: pnorbert

This PR rewrites the polling strategy on new steps in BP4 files (during streaming). It throws away the assumption that md.0 has all the step by the time md.idx has them. Instead, it actively checks and waits until md.0 is big enough so that every step found in md.idx is surely there.

This PR ought to fix the problem in #1745 (closed) but that still should be tested on Theta/Cori.

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