athenaHLT: Fixes for Python3
Call PyOS_AfterFork() in the child process. This seems to be required
in Python 3. Otherwise the child hangs (ATR-20871).
Also fix an integer division problem in TrigByteStreamTools.
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Call PyOS_AfterFork() in the child process. This seems to be required
in Python 3. Otherwise the child hangs (ATR-20871).
Also fix an integer division problem in TrigByteStreamTools.