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4b92bb6533
- add provisional support for selecting MPI_Gatherv when merging fields in the surface writers. Uses the 'gatherv' keyword [experimental] BUG: gatherv/scatterv wrappers used the incorrect data type - incorrectly checked against UPstream_basic_dataType trait instead of UPstream_dataType, which resulted in a count mismatch for user-defined types (eg, vector, tensor,...). This was not visibly active bug, since previous internal uses of gatherv were restricted to primitive types. COMP: make UPstream dataType traits size(...) constexpr - allows static asserts and/or compile-time selection of code based on size(1)