IoComponentEntry: code cleanup

Frank Winklmeierrequested to merge
fwinkl/Gaudi:iocomponententry into master

Implemented (7 year old) suggestion from @graven:

Binary comparisons are better done as friend, so that they are symmetric wrt. type conversions on lhs and rhs. There is no need for an explicit copy constructor, as the one generated implicitly will do the same thing.

Closes #26 (closed).

Edited by Frank Winklmeier

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