openPMD / openPMD-api / 1674

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Pull #410

travis-ci

IOTask: AbstractParameter Object Slicing

The IOTask constructor caused problems with Clang 4.0.1 on OSX,
where the `Parameter< Operation::CREATE_FILE >` does seem not to
copy the `name` member.
Thanks to Ray Donnelly for first seeing this!

It turns out that we copy the `AbstractParameter` base class,
which leads to object slicing.

https://stackoverflow.com/questions/274626/what-is-object-slicing
https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#Rc-copy-virtual
https://en.wikipedia.org/wiki/Object_slicing

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