list_for_Zhinan_for_SPECFEM2D_PMLs.txt

For SPECFEM2D PMLs:
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2/ example "LuoYang_fluid_solid_kernel"

currently, we still use potential as the adjoint source, we need to change to pressure in future.

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3/ PML_init.f90 and optimization of PML parameters:

put a flags in constants.h.in that decide do PML_parameter_adjustment implemented in pml_init.F90 or not
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