* This reduces conflicts arising from later changes of PATH at build
  vs configure time.

* So far there is a configuration for blizzard with full netCDF support.

This reverts commit 7952d726e58c795babbbdefa6689dc30d9b7626b.

* Instead of vars in order dictated by client streamWriteVar.
* This allows for differential handling of different stream types.

* This way all header elements can later be accessed directly.

* This will later ease distinguishing both in the MPI window index.

* At least for more recent versions of distutils:sysconfig.