todo
add llslon example
move all commands to cmd/
rm mainpkg, move to cmd/mumax3 and init
re-enable .go tests
fix test.bash
cleanup main
fix go test files
cleanup main
mumax3-convert: re-add -omf flag, fix ovf text output bug (Thanks Yan Zhou)
prepare for queue
basic queue mode
queue state protection
rework queue
nicer queue
queue render some html
fix: did not start gui for interactive mode
main cleanup
queue cleanup
engine cleanup