Made calling TGenCollectionStreamer::Generate thread safe #75
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Although each thread will get its own copy of TGenCollectionStreamer,
that copy is made by calling Generate on a global instance of the class.
Therefore Generate needs to be thread safe. This translates to requiring
TGenCollectionProxy::Initialize be thread safe. This required that
TGenCollectionProxy::fValue be atomic and be the last value to be set
in TGenCollectionProxy::InitializeEx.