lighttable: support drawing of arbitrary custom meta data as burn in.

use `plugins/lighttable/draw_custom_metadata=TRUE' in your darktablerc
and darktable will display the contents of a text file with the same name
as your image but .txt suffix as on overlay in one-image-per-row mode.
(cherry picked from commit 06c6a8b3116e8cbefb20416ca0309617951cf306)
opencl: add GeForce GT330 to the device list
(cherry picked from commit 0184af5c2f226ba52d494655d1a4060834692aa6)
opencl: remove superfluous asterisks from list of nvidia gpu's
(cherry picked from commit a3c40b9ad0fa1c7dc47b51845ceb9f42af8dd485)
pfm: load stat timestamp as date/time taken.

makes it possible to sort by more recent render in lt.
(cherry picked from commit 393ad00b10d9f4e40d13a6e3ce714d7e38eb9daf)
Make sure we update only the presets for the given operation.

There was a bug in this update SQL statement where all presets with
the same name and possibly for different module were updated.
(cherry picked from commit e20e5b15162082c192735fb18a7a9eade3f97dfe)
Fix bug: it is impossible to set image rating using the mouse

    When the option to show the ratings on all images is set, it was imposs
    to set the image rating using the mouse on the stars. Removing a bogus
    initialization that was called for every image fixes that.

Picked from: f7c2aa1594e3f0d07f5f2960d932eccf779821f9
picasa: remove all references to album privacy and hardcode it as private
(cherry picked from commit 80af1c44ac2509bbf66a44649695f3f35a198fdf)
picasa: change UI references to google+
(cherry picked from commit 4130a7f15b2c8500ea914e817b17f6d843af0795)
dither: make damping slider steps coarser
(cherry picked from commit 60a08a2a477ac160bb87690733c6a5f5fcef3e51)
(cherry picked from commit 8c01daecdadb1d67afb246fe85222fcf49ef50a2)
Fix typo introduced in ba7b0971eefc270e5a36b4201e7115d946b19964
Fix view.c new function for burn-in metadata to compile with stable branch.