Warning about active blue mapping in colorin

[jenshannoschwalm]

Blue mapping warning

If blue_mapping was still switched on from very old edits we at least want a warning.

[ralfbrown]

The test suite wasn't started until ~2021, by which time it wasn't possible to create sidecars for the suite with that option enabled.

When I worked on colorin a few years ago, I didn't find any sidecars with blue mapping enabled, so I stepped very carefully around that code.

[jenshannoschwalm]

Yes i saw that :-) thus i had to do a test version allowing toggling it on/off.
I had hoped that maybe some copy of history might have crept in the suite. None found.

I also did a test version enforcing it to be on running the suite, no visibly diffs to me.

after that i did the pr :-)

[jenshannoschwalm]

Sorry - i checked again the results of the full suite and there are indeed substancial differences in various tests if i force blue_mapping on (for sure it is not good with the now default late_shot-D65 mode.). So i guess removing it from code might give strange results for some images and we can't really test those.

Unfortunately there is something more bad with this test (blue_mapping on for cl and cpu code) It should at least produce identical results - it doesn't and give large differences. I did a quick check on OpenCL code and couldn't spot anything obvious so far ...

[jenshannoschwalm]

I removed the second commit and just left the code that gives at least a warning about those old edits.

[TurboGit]

Thanks!