hyphen - can cause problems with environment variables

The parameters are called useStencilMatrix and useHybridFreeSurface. If
not set, they will not be used by default and sparse matrices are used. Removing of
parameter UseSparse, now everything is implemented with the parameter UseStencilMatrix.

Change communicator to communicator within each shot domain

Merge branch 'develop' of https://git.scc.kit.edu/WAVE/FDSimulation_LAMA into develop

IsFinite functions are added for seismograms and wavefields. They are
called from the main file before writing the output seismograms.

function normalize should just normalize and not depend on the configuration.
Only one additional if condition is necessary in SOFI.cpp. This also helps to understand the code.

in this version geographer runs slow. Probably there is a problem with communicators ...

added function to read one column out of a txt

on juwels the job was killed when the first process returns 0
with shot paralisation not every erismogram weas written out then

only needed for internal models (only homogenous available)

numsamples and numtraces can be read from member matrix (seismogram matrix)

ModelRead=0 will generate a model on the fly
ModelRead=1 will read a regular grid model and mesh onto discontinuous
grid if variable grid is used
ModelRead=2 will directly read a discontinuous grid, this only works for the
variable grid