fix hyst slider
fix settings race switching back and forth

with thanks to George Trigonakis for pointing out
apply -> save, that's what it actually does
add credit to stargazer for awesome, countless bug reports

Signed-off-by: Stanislaw Halik <sthalik@misaki.pl>
use levmarq instead of coplanar POSIT implemented in numerically unstable fashion

Signed-off-by: Stanislaw Halik <sthalik@misaki.pl>
remove redundant initialization
buffer flush
fix crash due to mismatched float/double
fix copy-paste mistake
don't touch tvec scale
no need for ref here
sane default value for PT reset time
remove an outdated comment
remove hack of passing fov/w/h as member vars
replace hand-rolled timer class with QElapsedTimer
prevent empty video frame upon race
display extracted points' centers
fix translation estimation
reset levmarq internal state on reset (duh)
use proper scale for translation