Okada improve

Okada parameters as initial input: *) optimized by precomputing sin, cos, tan outside the loop and by evaluating X3=0, *) SW corner of area in which the bottom movement is evaluated can be omitted in okada_parameter_file *) more robust: the plates may have different SW corners (at the cost of individual interpolation step to irregular mesh for each plate) *) more robust: each rupture is considered at exactly one time step. Before, it could happen that the time of a rupture was not captured by TsunAWI timesteps. *) OpenMP support added *) Some code cleaning, combine routines for initial and later uplift.