lua : fix tags reporting all images instead of the ones attached to them
lua : gui functions are only available when gui is enabled
allow to pass a lua_State to dt_init

This lua_State will be used if provided.
if set to NULL, a new one will be created instead
lua : fix fomat.write_image not working properly
lua : allow darktable to be a pure lua module

you can now call DT from any lua script without an actual
instance of DT running
rawspeed: update to current develop branch
rawspeed: remove some cruft
rawspeed: better cleanup for update script
lua : add the possibility to import/export styles
Add the new MEF decoder for Mamiya raws
Add the needed data for the Mamiya ZD
Add MEF files to the libraw blacklist
Remove left-over debugging code
Replace ARW with MEF in some error messages
Merge pull request #591 from pedrocr/rawspeed-mamiya-support

Add rawspeed support for the Mamiya ZD
Add a new decoder for Hasselblad files
Add definitions for two Hasselblad cameras
Blaclist 3FR files from libraw
Merge pull request #592 from pedrocr/rawspeed-hasselblad-support

Rawspeed Hasselblad support
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.