Add AdiosWriterVerifyTest
The MR addresses #258 (closed) at least for the AdiosWriter classes. It does so by adding a Python script to compare the output of the ADIOS tool bpls run on the BP-files created by the AdiosWriterTest to stored references. Jobs that run the AdiosWriterTest will also run the corresponding AdiosWriterVerifyTest, if HYTEG_BUILD_WITH_PYTHON3
is activated.
The MR also adds a parallel version of the AdiosWriterTest to ensure that the output works not only in a sequential setting.
This MR supersedes the previous versions !788 (closed) and !797 (closed).