Higher temporal order with Adams-Basthforth method
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.
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src/prepare_update_s_4.c
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src/update_s_elastic_PML_4.c
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src/update_s_elastic_abs_4.c
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src/update_s_visc_PML_4.c
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src/update_s_visc_abs_4.c
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