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The fixed bug was the ignoring of the ldaU XML element if the version number
of the inp.xml file was not 0.29. For the NiO_ldauXML test this meant that
no linear mixing was used for the density matrix.

Please note that there are still slight differences between the results
obtained with this version and the last release version. I changed the
reference value for the total energy from -3191.9717 to -3191.9707.

Note: Also in this commit:

1. Changed test values in NiO_ldauXML test since now the broyden files get deleted
   when a new density matrix is generated
2. The NiO_ldau test should not work any more since linear mixing for the density
   matrix is removed for the old inp file. (It is not specified in the n_mmp_mat
   file any more)

Note: The NiO_ldau and NiO_ldauXML tests had to be adapted to this new
behavior of the code. The new behavior is reasonable.

Somehow the testcase was ended due to the now commented line if the files
were not found. As it was ended, the succeeding validations could not be run
and the test passed. But it should have failed.

This was relevant for the MPI eigenvector parallelization for this test case.
This is not implemented and therefore has to fail.

...we have no idea why it was in there. But tests should not ignore warnings.

a) fixed CuDOSXML test
b) made compile with PGI
c) change testscript to work without "do"

Also in this commit: improved Htr to eV factor in evaldos and
                     adapted the related tests.

In brzone2 the IBZ is constructed with a different algorithm in comparison
to brzone. The outcome is that the corners and faces of the IBZ are provided
in a differnt order. Note that there is no clear order for these lists
predefined. The k-point mesh generated by kpttet slighly relies on the order
of the faces and corners. So the usage of brzone2 lead to the generation of
a slighly different but also correct k-point mesh.

The energy mesh in the DOS.1 file depends on the k-point mesh. Thus the
energy grepped for in the CuDOSXML test had to be adapted to the new mesh.

configure.sh script is doing part of the job now
more details should be found in README (later :-) )

...since we don't have these executables any more.

After making CPP_CORE the default in Fleur runs some
tests didn't work any more. I adapted the reference values
from theses tests. Everything works again.