adobe_coeff: no longer automatically derived from dcraw

remove dcraw related stuff

dcraw's matrices depend on very fuzzy matching which with
some recurrence causes regressions.

we're going to maintain adobe_coeff ourselves :(
Fix histogram double-click (initially reported by Roumano in darktable-devel ML)
colorin: notify user if color matrix is missing
Lens IOP: add autodetection, based on fact "did user or did not changed anything in GUI from autodetected values"
Lens IOP: fix 2->4 migration
Fix lens iop when applied "automatic preset" and changed something in gui when lens data is missing in exif