Add denoise profile for PENTAX K100D Super.
Merge pull request #533 from bovender/master

Add denoise profile for PENTAX K100D Super.
Thanks to @bovender for noticing Pentax K100D and K100D Super having the same sensor.
Simplify "typedef struct dt_iop_params_t ..." to "typedef void dt_iop_params_t;"

FIXME: i moved typedef into pixelpipe.h to fix redefinition (or cyclic dependency). Find a better place.