relax SVN archive

Removed all usages of the has_attr() dictionary method.

This was down with the python 2.x to 3.x script with the commands:
2to3 -f has_key relax . -w

The change is in preparation for Python 3.0, and relax still works with Python versions 2.4, 2.5,
and 2.6.

Bug fix for the relaxation curve-fitting difference plot script.

The spin_loop blocks were missing colons!

Replaced all instances of `x` with repr(x).

This was down with the python 2.x to 3.x script with the commands:
2to3 -f repr . -w
2to3 -f repr relax -w

The change is in preparation for Python 3.0, and relax still works with Python versions 2.4, 2.5,
and 2.6.

Fix for the test_opt_constr_newton_gmw_mt_S2_0_970_te_2048_Rex_0_149() system test.

The 2 different f and g count values on 64-bit GNU/Linux are now checked. This difference is
present even when the same Python and numpy versions are used, and is therefore likely to be gcc
or the blas/lapack libraries causing differences.

Bug fix for the kron_prod() function.

The T23 rather than T14 transpose should now be used! And the resultant matrix is now returned to
the correct, original rank-2 shape.

Fix for the test_kron_prod() unit test.

The R2 matrix didn't match the tested real Kronecker product.

Expanded the test_kron_prod() to check all elements of the matrix.

Added a unit test for the maths_fns.kronecker_product.kron_prod() function.

Fix for the calls to transpose_14(). This operates on the matrix rather than returning a new one.

Fix for the kron_prod() function.

The transpose_14() function works on the given matrix and returns None!