message: Blosc: Warn Unknown Parameters
  Warn the user if unknown parameters are passed to the blosc
  compressor. Otherwise, typos get quickly unnoticed.
diff: @@ -20,6 +20,7 @@ extern "C" {
  #include <algorithm>
  #include <cassert>
  #include <cstring>
  +#include <iostream>
  namespace adios2
  {
  @@ -140,6 +141,12 @@ size_t CompressBlosc::Compress(const void *dataIn, const Dims &dimensions,
  if (thresholdSize < 128u)
  thresholdSize = 128u;
  }
  + else
  + {
  + std::cerr << "ADIOS WARNING: Unknown parameter keyword '" << key
  + << "' with value '" << value
  + << "' passed to Blosc compression operator." << std::endl;
  + }
  }
  // write header to detect new compression format (set first 8 byte to zero)
  