Update: Merge test

-Remove src_relicts
-Clean up of the Makefile in src/

Removed gfortran and f2c as known dependency.

adjustment of acoustic toy-example, scaling of the elastic explosive source and acoustic free surface condition.

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.

Programs in contrib/stfinv/tests are not required by DENISE but may cause
confusion since they require libtfxx which is not part of the vendor import.

The Fortran part of the vendor code is not used by DENISE. It can safely be
discarded. This way, no Fortran compiler is required when compiling and
installing the code in subdirectory contrib, except for code in aff/tests,
which however is not part of the install target.

Check whether FC is set from the value of implicit variables (origin is
default). If yes, replace value of variable. If not, FC most likely is set by
intention of the user. Do not alter the value in this case.

Let doxygen output be written to a subdirectory of contrib rather than
$(HOME)/public_html

To make the doxyview target operational an absolute path name is required.
Therefore add the abspath function of make to the generation of variable
CONTRIBDIR.

Since vendor Makefiles make use of special GNU make features, we can safely
rely on GNU make being in operation. GNU make provides the variable
MAKEFILE_LIST from which the relative path can be extracted at which
Makefile_var was found. This exactly is the path of the contrib directory,
such that the user (calling Makefile) needs not set this variable.

Currently the calling Makefiles still set a variable CONTRIBDIR which then
simply is overwritten in Makefile_var. Such the setting of CONTRIBDIR is
unnecessarily doubled.

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

Conflicts:
	par/in_and_out/toy_example/toy_example_ac_INV.json

For the exchange of the wavefields a wrapping layer of FDORDER/2 is needed.
Nevertheless a wrapping layer of FDORDER/2 +1 was implemented because of undetected errors in the exchange functions.

Added taper for inverted source time function (use switch TAPER_STF, see taper.c for definition) and individual time windowing (use switch TW_IND, then three columns are expected in PICK_FILE for each trace with picked time - twl plus - twl minus, in this case TWLENGTH_PLUS and TWLENGTH_MINUS are ignored). Time windowing is now also applied during the inversion of the source time function.

Apply modifications, such that Seitosh source code is correctly installed
within the DENISE directory hierarchy upon running make in subdirectory par.

Modifications applied are:

  contrib/Makefile_var
    - correct syntax for reference to environment variable HOME
    - set FC variable only if not set in environment

  contrib/libcseife/Makefile
    - include contrib/Makefile_var to set installation path variables

Merge branch 'vendor_Seitosh'

Conflicts:
	contrib/aff/README.export
	contrib/fourier/README.export
	contrib/stfinv/README.export

Commands executed on branch master (as a guideline for future imports):

  git merge -X theirs vendor_Seitosh
  git rm contrib/*/README.export
  git commit

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.

Merge remote-tracking branch 'GPIAG/master'

Merge branch 'import_Seitosh'

This is a no-op commit, since the contents of subdirectory contrib in master
and in import_Seitosh are identical. This merge creates a pathway for future
vendor imports.

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).

+  changed link to Mailinglist registration

char wm[1] should be wm[2], due to reusage of wm later on.

added manual_DENISE.pdf to gitignore. A copy of the manual will be placed in the gitlab wiki https://git.scc.kit.edu/GPIAG-Software/DENISE/wikis/home