make mkfs.* use config files (-c for mkfs.xfs)
export and initialize mouse_delay and mouse_speed_factor (test and cover func mouse_acceleration)
lsstat to decrease tests size
separate dirs for each image
include umka_os to tests
tests with writing to block devices (read-only base image + discardable image for writing)
library loader
validate against the reference XFS implementation
stressing via ref impl (how?)
multithreaded: kofu one.t two.t
