Following some more testing, in particular with files at
https://github.com/bitsgalore/jp2kMagic/tree/master/sampleImages, I've
added some of the proposed extensions to xv upstream and left out jpm
and mj2 which it doesn't display for me. qiv doesn't seem to support
any of these files, and I still
I'll look into this, but initial test results on my Fedora 25 system
are that qiv doesn't seem to support any of these files, xv does at
least some, and I don't have ee available so can't test with it at
all. BTW it would be preferable to report/discuss this upstream,
