Relion now uses `rlnOriginX(Y)Angstrom` instead of `rlnOriginX(Y)`

[j-c-c]

Newer versions of Relion use Angstrom values for image offsets instead of pixels (see docs). The Relion metadata name has also been changed to rlnOriginX(Y)Angstrom. This causes an error if a user saves an ImageSource in ASPIRE and attempts to open the starfile in Relion, as the name rlnOriginX(Y) is not recognized.

[garrettwrong]

I'm sort of suprised they don't admit the old attributes or allow opening an older format file. I would think this would be a pain for them (unable to open their own files from a prior save...?).

Before getting too far, for a quick fix, it would be good to check that this isn't resolved my saving with a format/version attribute (that we are presumably missing).

I say that because while the right thing to do is to move toward >=3.1 attributes, a complication there is this will require pixel size in the base ImageSource class (or manually at save, annoying for devs), and in a way that doesn't clash with things that input/operate with ImageSource (filters etc). This issue probably will require more code reading/planning than it seems superficially.

[garrettwrong]

We have pixel size thread through our classes now. @j-c-c , maybe consider picking this up again.

[garrettwrong]

Maybe we can tackle this now. IIRC I had thought about allowing ASPIRE to read either variation, emit a warning if older version style attrs, and always save our files towards the current version. This probably requires changing out internal attrs to be consistent with the current version if this is not already the case.

[j-c-c]

Resolved in #1302