for AliDevice (or derived) objects.
05-aug-2005 NvE Typos fixed in AliAttrib::GetCalFunction and AliAttrib::GetDecalFunction which
erroneously always returned a null pointer.
+10-aug-2005 NvE AliSignal::GetSignal extended with mode=8 to support dead flag of parent device
+ in conjunction with the dead flag of the signal itself.
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