darktable 1.6.2

this is a new stable point release, no big new features added.

sha256sum darktable-1.6.2.tar.xz
66ee5f8ce5df9169211980fa374dc686eaf74322e0bd363a56612ae808bdc5bd

sha256sum darktable-1.6.2.dmg
bd613994c9754313144e8804026b7faf672fa816801b687ff7d64a8d82880332

General improvements:
 - Better names for key accels (no more <Primary>)
 - Local gallery export limited to useful web formats (JPEG/PNG/WebP)
 - Add a way to control the brush size with keys
 - Default X-Trans Demosaic to markesteijn (single pass)

Bugfixes:
 - Fix IPTC Keyword reading for real
 - rawspeed: support short values in DNG ActiveArea
 - really disable parallel export
 - remove special characters from style export
 - Cropping aspect ratio fixes (#9942, #10265)
 - Some fixes to lua/masks/brushes

Camera support:
 - Pentax *ist DS
 - Pentax *ist DL2
 - Pentax K110D
 - Sony A7 II
 - Sony ILCE-3500
 - Nikon 1 S2
 - Olympus E-450
 - Panasonic LX1
 - Panasonic G3 (aspect ratio modes)
 - Samsung NX1 blackpoint finetuning
 - Fuji X-E1 blackpoint finetuning
White balance presets
 - 7D Mark II (updated)
 - Olympus E-M1
 - Sony A99