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more testing of IO/Engine functionality and a fix for the Fortran bindings

Podhorszki, Norbert requested to merge github/fork/germasch/pr/testing_io_engine into master

Created by: germasch

This still covers only a small piece of Engine-related IO functionality, though it was enough to find a bug in the Fortran bindings: When returning strings of 0 length from C to Fortran, the old code would leave the Fortran string in deallocated state, which leads to a crash when checking its content. Fortunately, Fortran allows for 0-size allocated arrays/strings, so the fix is to return just that.

This PR also adds adios2_engine_name() to the C and Fortran APIs, as the same functionality exists in the CXX11 API.

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