Updated Dutch translation
Merge pull request #794 from MRIG/master

Updated Dutch translation
Add some const qualifier where possible.
[usermanual] Make sure URLs to external HTML files aren't getting .php appended
Use const qualifier where possible.
Minor code rewrite to avoid distributed complexity.

Better to handle the +1 offset for the \0 characters in a single place.
Diferent black points for samsung NX1 high iso
Some more const where possible.
dt_imageio_export_with_flags(): do not leak memory upon error.
Fixes Coverity CID 1260259
Move wb_presets.c to external/
Update beautify_style.sh

Also added "// clang-format {off,on}" to colormatrices.c and
noiseprofiles.h to prevent them from "manual" beautification.
add "// clang-format {off,on}" to nvidia_gpus.h
snapshots: fix drawing offset for new border system. fixes #10228

(cherry picked from commit ab30ec4abd8c1bdf5e0b5e82479f86d1036b3622)
Add the Pentax *ist DL2 do rawspeed
collection: factor out query string for number+op subacases
collection: factor out query property listing for iso, aperture
collection: expose focal length as filter
collection: expose focus distance as filter