Re-added the clipping check on raw values, but with a higher threshold. This way, raw clipping is less frequent in highlight areas (so those can be used as spots for exponents calculation), but the threshold is low enough to avoid the segfaults.
Not a very clean solution, need to find a better one...
The check is now causing problems with the dual-spot feature, because after clipping, the formula cannot be undone to get back the original raw values.
Since there are no known issues caused by raw values >65k, i'm removing the check until there will be a good reason to re-introduce it.
This way, if the user has chosen a different master exponent than the default, using the feature just alters the color characteristic of the conversion, while keeping the same contrast level.
Switched back to vector sort for median calculations: the results of the histogram search function diverge more and more from the simple median calculation as the exponents increase.
At 2.0 the test picture is already impossible to WB as the multipliers are too far off (2.78226e+08 histo vs 9.7927e+11 sort), and the normal WB sliders can't compensate for those huge factors.
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
