First commit of SpAMMPack.

A linear algebra code for hierarchical truncation in the (matrix-matrix)
product space.  Uses trivial GEMM blocking at leaf nodes.  Sort of interfaced
with main body of FreeON, and can be compiled in single or double precision
mode.  Plans to interface N. Bock version, recode in C and extensively
document, add non-orthogonal versions, density matrix perturbation and
advanced OpenMP implementations.
Orthogonal and non-orthogonal SP2 working.

For non SCF ordered test (Vancomycin) and single precision, we see times like:

48 seconds for  nonorthogonal with explicit Pao.S.Pao
7-8 seconds for nonorthogonal with (Pao.S).Pao
2 seconds for orthogonal with Por.Por

The first effect is because the explict P.S.P is completely expanded out (ie
no factoring of P.S first), and the SpAMM norm is unable to overcome the
increased complexity.  The second is because Pao fills like S^-1 and is not
less dense enough relative to S to make the extra multiply worth our while.

So, the hands down winner is Por.Por.
Tidied up the spammpack makefile a bit.
Added options for PGI to makefile.

Optimization was messing up the RQI eigenbounds, so I tweeked the parameters
for that so that it works with test cases.  Probably need more tweeking later.
So far, can get maybe 85-90% of intel result with PGI.  Could spend all
freeking day screwing with compiler flags here!
Changed mode.
Added tags target.
Added autoconf/automake to SpAMMPACK.
Renamed some files.
Re-arranged some files in SpAMMPACK.
Added dependencies to makefile in SpAMMPACK.
Added doxygen hooks into makefile for SpAMMPACK.
Updated license information to GPLv3.
Added license information to SpAMMPACK.
Added more documentation to SpAMMPACK.
Added openmp option to configure script in SpAMMPack.

By default openmp is turned on, but can be disabled with the --disable-openmp
configure argument.
Some changes.
Some fixes for OpenMP part of SpAMMPack.
Adding GPL license information (COPYING) to SpAMMPack.
Started adding unit tests (SpAMMPack).
Renamed module SpAMM_PACKAGE to spammpack.

Programs wanting to use spammpack now have to "use spammpack".