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CbmDefs.h: Use fwd declaration of std::ostream.

Felix Weiglhofer requested to merge fweig/cbmroot:cbmdefs-iosfwd into master

Replace the relatively heavy iostream with the lightweight alternative iosfwd that provides a forward declaration for std::ostream in CbmDefs.h.

Edit: Also see here, why it's useful to avoid including iostream when it's not needed.

Edited by Felix Weiglhofer

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