ELPA can now be linked against a 64bit integer version of MPI and
ScalaPack. This is an experimental feature

The following points are still to be done
- does not work with real QR-decomposition
- generalized routines return wrong results
- the C tests and the C Cannon algorithm implementation do not
  work (no 64bit header files for MPI *at least* with Intel MPI)

ELPA can now link agains a 64bit integer verion of BLAS/LAPACK.
Currently this only works if ELPA is compiled with MPI=OFF!

The 64bit support is not available in the legacy interface

Seperate the variable type definition of the library and the test programs

See merge request !21

Auto detect

See merge request !20

On heterogenous cluster, of nodes with different CPUs the _experimental_
feature (--enable-heterogenous-cluster-support) can be used:

It compares the (Intel) cpuid set of all CPUs which are used by ELPA MPI
processes and finds the SIMD instruction set, which is supported by all
used CPUs. The ELPA 2stage back-transformation kernel (a.k.a "kernel")
will be set accordingly on all MPI processes.

This feature, can override the setting of the kernel done previously by
the user!

At the moment it will only work for Intel CPUs, i.e. clusters consisting
of nodes with Intel CPUs and e.g. AMD CPUs are at the moment _NOT_
supported.

Since this is an experimental feature, it might be dropped again in the
future, if it turns out not to be useful for the users

This release just additionally packages the src files from the legacy interface,
which had been forgotten in the previous release

Obviously, recent versions of automake decided to filter out
an "test_" string which led to some surprises