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By using an operator of FDORDER length an addiotional frame around the subgrids with FDORDER/2 length instead of FDORDER/2+1 length is needed.
For example by using second order you will need one additional gridpoint to calculate the differences.

(can be found in file COPYING.)
+ changed link

Added the Adams-Bashforth method to the documentation.
ATTENTION: The documentation is now compatible with pdflatex, so it is strongly recommended to use pdflatex.

Added a new switch FDORDER_TIME to use a fourth order accurate temporal FD-scheme. This is realized with the Adams-Bashforth method.
Possible values for FDORDER_TIME are 2 and 4, whereas 2 refers to the classical leapfrog scheme.

TSNAP2 will be set to TIME if TSNAP>TIME. ( Time is recalculated to TIME=NT*DT in sofi3D.c and thus can differ to TIME given in .json. So even if TIME and TSNAP2 are equal in .json they can differ in the checkfd functions)

1. added derivation of the explosive source. This is necessary because the explosive source will be read in after the wavefield updates. Also the scaling of the explosive source is now corrected. 2. RSG isn't implemented in the current release