Added performance improvements suggested by heckflosse. Lowered median sampling step from 7 to 5 since calculation is now much faster.
Added support for Fuji X-Trans raw files.
Applied SSE2 patch provided by @heckflosse, improves performance in main processing loop.
Moved film negative processing stuff in its own compilation unit.
Code cleanup: removed redundant omp directives.
Added check for dead pixels, going above threshold after inversion. ST_BAYER only for now.
Reverted leftover hack in cropwindow.cc
