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It turned out that if a CPU supports SSE the already existing
test for SSE assembly instructions always passes.
However, the compilation of gcc SSE intrinic instructions might
nevertheless fail if gcc is not called with one of the options
"-msse3", "-msse4" , "-msse4.1", "-msse4.2", "-mavx", or "-mavx2"!

Obviously gcc does still not consider SSE as a standard on X86_64
Intel CPUs.

An additional configure test has been introduced, which test for
gcc intrinsic sse instructions. If this test fails, the corresponding
kernels are switched off.

The utility binary printed the available kernels to stderr.
This is changed. The ELPA library itself still does all prints
on stderr

The SSE kernels with blocking of 2,4,6 (real case) and 1,2 (complex)
case are now available by default

Thus the following changes have been done
- introduce new macros in configure.ac and Makefile.am
- renmae the AVX kernels in AVX_AVX2 (they also support AVX2)
- introduce new files with SSE kernel
- introduce new kernel parameters !
- make the SSE kernels callable

The results are identical with previous kernels

- the contact email is now: elpa-library@mpcdf.mpg.de
- the official website is now hosted at http://elpa.mpcdf.mpg.de

The Rechenzentrum Garching (RZG) has been renamed into
the Max Planck Computing and Data Facility (MPCDF).

This is reflected now in the adapted headers.

In the near future, all references to the ELPA webside and
the ELPA email will also be adapted.

C interfaces are now available and definied in the header
elpa.h

If the QR-decomposition is used wrongly (matrix size is not a
multiple of block size) the the execution will abort, in
order to prevent the wrong results, discussed in a previous commit

Debug messages are now available by setting the environment variable
"ELPA_DEBUG_MESSAGES" to "yes".