Prepare for .4

[ci skip]

RELEASE_NOTES

@@ -1,18 +1,48 @@
-we're proud to announce the third bugfix release for the 2.2 series of darktable, 2.2.3!
+we're proud to announce the fourth bugfix release for the 2.2 series of darktable, 2.2.4!
 
 as always, please don't use the autogenerated tarball provided by github, but only our tar.xz. the checksum is:
 
-    $ sha256sum darktable-2.2.3.tar.xz
-    ???  darktable-2.2.3.tar.xz
-    $ sha256sum darktable-2.2.3.dmg
-    ???  darktable-2.2.3.dmg
+    $ sha256sum darktable-2.2.4.tar.xz
+    ???  darktable-2.2.4.tar.xz
+    $ sha256sum darktable-2.2.4.dmg
+    ???  darktable-2.2.4.dmg
 
 #### Important note: to make sure that darktable can keep on supporting the raw file format for your camera, please help us by visiting https://raw.pixls.us/ and making sure that we have the full raw sample set for your camera under CC0 license!
 
-and the changelog as compared to 2.2.2 can be found below.
+and the changelog as compared to 2.2.3 can be found below.
+
+## New features:
+
+- Better brush trace handing of opacity to get better control.
+- tools: Add script to purge stale thumbnails
+- tools: A script to watch a folder for new images
 
 ## Bugfixes:
 
-- Fix fatal crash when generating preview for medium megapixel count (~16MP) Bayer images
-- Propely subtract black levels: respect the even/odd -ness of the raw crop origin point
-- Collection module: fix a few ui quirks
+- DNG: fix camera name demangling. It used to report some wrong name for some cameras.
+- When using wayland, prefer XWayland, because native Wayland support is not fully functional yet
+- EXIF: properly handle image orientation '2' and '4' (swap them)
+- OpenCL: a few fixes in profiled denoise, demosaic and colormapping
+- tiling: do not process uselessly small end tiles
+- masks: avoid assertion failure in early phase of path generation,
+- masks: reduce risk of unwanted self-finalization of small path shapes
+- Fix rare issue when expanding $() variables in import/export string
+- Camera import: fix ignore_jpg setting not having an effect
+- Picasa web exporter: unbreak after upstream API change
+- collection: fix query string for folders ( 'a' should match 'a/b' and 'a/c', but not 'ac/' )
+
+## Base Support:
+
+- Fujifilm X-T20 (only uncompressed raw, at the moment)
+- Fujifilm X100F (only uncompressed raw, at the moment)
+- Nikon COOLPIX B700 (12bit-uncompressed)
+- Olympus E-M1MarkII
+- Panasonic DMC-TZ61 (4:3, 3:2, 1:1, 16:9)
+- Panasonic DMC-ZS40 (4:3, 3:2, 1:1, 16:9)
+- Sony ILCE-6500
+
+## Noise Profiles:
+
+- Canon PowerShot G7 X Mark II
+- Olympus E-M1MarkII
+- Lge Nexus 5X