Add denoise profile for PENTAX K100D Super.
Use American English, not English proper
Fix some strings
l10n: Update German translation
Use a star for the "show overlay" button

The circle never made any sense.
usermanual: various updates
Update French translation.
Remove an unneeded test

... to make Coverity happy.
IOP Exposure: GUI: capture sourcefile histogram only when really needed
usermanual: update for the levels module
usermanual: several updates and corrections
IOP Exposure: s/deflicker_level/deflicker_target_level/
Update French translation.
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.
Merge pull request #587 from LebedevRI/typedef-void-dt_iop_params_t

Simplify "typedef struct dt_iop_params_t ..." to "typedef void dt_iop_pa...
usermanual: update on highlight reconstruction
Updated Czech translation
Add support for rotating the wattermark.
Minor reformatting.