* And use that if available.

* It's at the moment identical to the 1D test. That will change with the next commit.

* Also include namespaceNew and namespaceDelete in cdi.h.

* This should complete the separation of serial and parallel parts
  of the library.

* This also adds separate documentation, header, Fortran wrappers and
  pkg-config file for the cdi-pio part of the library

* This will allow for later additions of more complex tests.

* The added pkg.m4 accounts for pkg.m4 sometimes not being available or
  having another version.

* If these are set they already override the corresponding variable.
* Also reduce number of spurious linefeeds in configure.

* Makefile.am became desynchronized from Makefile.in.

This reverts commit r2206.

This reverts commit r2212.

* Said generic can be replaced with an MPI-specific version, thus
  cleanly separating serialization of meta-data itself and MPI-
  communication.