Announcement: libgphoto2 2.5.17 release

Hi folks,

I have just released 2.5.17 of both libgphoto2 and gphoto2.

Quite some Canon EOS related bugfixes ... Including hopefully solving the "Error 70"
error various people have seen on large EOS RAW downloads.

More changes below...

Thanks to all contributors, patch suppliers, bug reporters, translators
and users :)

Ciao, Marcus


libgphoto2 2.5.17 release

ptp2:
* Apple iOSX: handle root directory objects that have ParentObject==StorageID instead of 0
* implement PTP 1.1 Manifest reading and hook into filesystem. currently only supported
  by Apple iOS.
* Canon PowerShot CHDK live view support.
* Canon EOS: prepare capture needs to wait a bit on a crucial place to get all events.
  might fix some PTP Device Busy reports.
* Canon EOS: split bulk downloads into pieces of partial downloads. This might cure the Error 70.
* Canon EOS: Improved EOS M capture
* Canon CHDK: live preview capture support added
* Added USB IDs:
  * Sony A7r III
  * Nikon CoolPix L430
  * Nikon D850
  * Canon EOS M2, M6, M100
  * Canon EOS 6D Mark II
  * Fuji Film X-Pro 2

pentax:
* Code updates imported from pkremote

libgphoto2:
* Report file changes via GP_EVENT_FILE_CHANGED (hooked up for Canon EOS currently)

translations:
* updates spanish, chinese

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