Merge pull request #1 from clauniel/master

pull fra carsten
IIR filter, der alligevel ikke skal bruges..., system-svg skal rettes for at passe med kalmanfilter
Merge branch 'master' of https://github.com/skrogh/31015
fjernet matlabfilter
startet estimator
Merge https://github.com/clauniel/31015
estimator done
do not free kalman filter in destroykalman