Don't use GnomeKeyring >= 3.12.0

They broke their API by deprecating the shit out of it and I don't feel
like cleaning up behind them. Merging libsecret support should be the
real fix.
Fix CID 1233591: Misplaced #ifdef
usermanual: update on geotagging panel thanks to Rudolf Martin
colorout: rename misleading high_quality_processing const to force_lcms2

our code already has a real high_quality_processing config property,
using an identical variable for something entirely different is
highly confusing and potentially misleading.
Colorin IOP: prevent crashes in legacy presets update infrastructure
Same as aa9a36330fafe0b965c47c255f52e59e174badab

TODO: go through each reload_defaults() in src/iop/* and fix all similar cases.
Prefer zero initializer over memset

Created using following semantic patch and Coccinelle:

@@
type T;
identifier tmp;
@@
- T tmp;
+ T tmp = { 0 };
- memset(&tmp, 0, sizeof(T));
Cacorrect IOP: prevent crashes in legacy presets update infrastructure
Colormapping IOP: prevent crashes in legacy presets update infrastructure

memset's are not needed. I checked that (at least when using C99 initialization), everything is zero-initialized by default.
Demosaic IOP: prevent crashes in legacy presets update infrastructure
Flip IOP: prevent crashes in legacy presets update infrastructure
Highlights IOP: prevent crashes in legacy presets update infrastructure
Rawdenoise IOP: prevent crashes in legacy presets update infrastructure
Temperature IOP: prevent crashes in legacy presets update infrastructure
lua : fix a bad case of use before init
#10097: uncommon .jpeg files aren't RAWs
Add groupid & flags to image information lib

This is mostly for debugging purposes, so we migth #ifdef it out when
building from a source package and only leave it in when compiling from
git.
Use size_t to store buffer sizes. With this (and probably following), DT can open 26770x13385 TIFF
_read_planar_16(): get rid of dt_imageio_write_pos()
Was done when trying to open 26770x13385 TIFF
_read_planar_f(): get rid of dt_imageio_write_pos()
_read_planar_8(): get rid of dt_imageio_write_pos()