[aryion] get post ID via gallery-item (Fixes #981)

[kattjevfel]

This makes gallery-dl able to get aryion posts lacking a thumbnail, such as many text documents.

[mikf]

Thank you, but this doesn't work when fetching IDs from https://aryion.com/g4/latest.php?id=…, i.e. with recursive disabled. I guess we could use the old method for "recursive": false and yours for "recursive": true.

[kattjevfel]

I wasn't aware of that even being an option. It there a reason someone would turn off recursive? I might be missing something here but I don't see any reason in using https://aryion.com/g4/latest.php?id=.

On my end (with nothing but filename and login details set), everything seems to be working just fine. Both individual posts and entire galleries.

EDIT: If any reason happen to be that I did it that way in my bash script, it's simply because I was lazy and didn't wanna implement directories. But your implementation is superior in every single way.

[mikf]

The initial implementation was using /g4/latest.php?id=, because both your script and the one from #673 used it, but then #832 came along and a recursive option was added to ensure backwards compatibility.

bc48514 should work for both strategies. Again, thanks for your fix.