start mumax3-convert rework
data: change log.Panicf -> panic(fmt.Sprintf
mumax3-convert: all image formats, preprocess, don't panic
mumax3-convert: remaining formats, don't overwrite input file
stash
fix closure caveats, add -show
mumax3-convert: skip based on time stamps
increase httpfs buffer size
mumax3-convert: report stats
mumax3-convert: remove empty output files on failed convert
Merge branch 'feature/mumax3-convert' into arne
re-add accidentally removed testdata/mask.png
mumax3-convert httpfs timestamp workaround