change default filters to 0.2Hz and 20Hz, as per UKB expert working group meeting discussion
change default filters to 0.2Hz and 20Hz, as per UKB expert working group meeting discussion

aidendoherty/biobankAccelerometerAnalysis,aidendoherty/biobankAccelerometerAnalysis,computationalEpidemiology/biobankAccelerometerAnalysis,computationalEpidemiology/biobankAccelerometerAnalysis