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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

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

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