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Code in contrib/aff/tests is not required as part of Seitosh.
However, the test code requires additional settings like proper interlanguage
linking (C++ and Fortran). To reduce the constraints on the installation
environment, discard the subdirectory tests in contrib/aff entirely, as well
as all references to the test code made in the Makefile.

The mechanism in contrib/Makefile_var which was used to set the make variables
expected by the Seitosh vendor code only worked for Makefiles in the next
subdirectory level below contrib. This was due to relative paths used in the
definitions. By passing the relative path of the contrib directory to
Makefile_var in a make variable, allows Makefile_var to the path values
appropriately for any Makefile in any directory, which include Makefile_var

Drop current version of Seitosh code. The contents are taken vom branch master
of [Seitosh](https://git.scc.kit.edu/Seitosh/Seitosh). The current master
commit in Seitosh is 8d7894a642.

Commands executed in the root directory of DENISE:

  rm -rfv contrib
  mkdir -pv contrib
  cp -vprd ~/git/Seitosh/src/libs/libaff contrib/aff
  cp -vprd ~/git/Seitosh/src/libs/libfourier contrib/fourier
  cp -vprd ~/git/Seitosh/src/libs/libseife contrib/libcseife
  cp -vprd ~/git/Seitosh/src/libs/libstfinv contrib/stfinv
  git add --force contrib

Since Seitosh on purpose does not provide export branches where source code
exports would be assembled in a hand-picked fashion, whole subdirectories from
Seitosh are simply copied. As a conseqeunce, the directory libcseife now also
contains Fortran code not really required by DENISE.

The current commit actually is prepared by just copying the contents in
subdirectory contrib of master (070ed2f0) in DENISE. Apart from minor
modifications contents are identical with revision 379 in subversion
repository FWI_elastic/DENISE which was the final import merge after the
vendor drop of 1.2.2013

Replay vendor drop as took place in the original subversion repository of
DENISE. Source code from the subversion repository of TFSoftware was copied to
vendor branches aff, cseife, fourier, and stfinv.

aff:     subversion revision 372
cseife:  subversion revision 369
fourier: subversion revision 375
stfinv:  subversion revision 378

Source code is copied from tag directories 20130201

Notice: The contents of this commit are not in sync with the corresponding
export tags as present in the Seitosh repository. This must be due to
unintentional modification of files when copying contents as tagged for export
in TFSoftware to the vendor branch in the subversion repository of (formerly
called FWI_elastic/DENISE).