adobe_coeff: FUJIFILM X-Series support

Coefficients via dngmeta.sh. These match those in dcraw 9.21, except
for black/white levels which dcraw does not give.
Merge pull request #593 from dtorop/xtrans-adobe-coeffs

adobe_coeff: FUJIFILM X-Series support
rawspeed: update to current develop branch
Merge branch 'master' of https://github.com/darktable-org/darktable
Fix typo.
Rename module to module_version which is clearer.
New routine dt_view_image_only_expose to display only an image.

This will be used by the print module.
Initial revision.
WIP
TBS: init
WIP
Some CUPS testing.