seismogramm output
- The Seismogramm header has to be optimized in the su case,
- segy outputs needs more testing, maybe reduce su (liitle endian), binary and ascii output would be a good idea, only ascii and su input is implemented jet anyway.
- overwriting existing su files doesn't work right it all cases
- merging the seismogram in the code would give a speedup (less data in/output) / or reactivate seismerge program to handle this issue after the inversion.