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with invsatom=0 etc. in case of LDA+U and SOC. Furthermore the i_u counter was reset
for more that one atom per type in hsmt_extra.F90. l_lo1 and some fix spin-spiral + LO
in pathological cases introduces in vec_for_lo.f90. The "scalar relativistic" energy
parameter calculation for LO's was introduced in lodpot.f90. This will change the
total energy in some test cases.

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)

...also in this commit: Replace multiple definitions of lmaxb by a single constant lmaxU_const.

This is not yet tested.

Removed preprocessor switches CPP_SOC, CPP_INVERSION, CPP_APW, CPP_CORE.
Only a single fleur executable is built.

Based on v0.26 hybrid branch