don't put NAs on top
find.changed.mean
filter.colnames
cleanup copy/paste
find.anomalies
forgotten library
check segment size before calling breakpoints
filter by sd/mean ratio
remove useless find.normal
summarise cpu columns
speed up cpu sums
todo
find.breakpoints (renamed from find.anomalies)
detrend
find.distribution.change (empty yet)
allow to filter same dataset several times
find.distribution.change
omit NAs in find.distribution.change
use medians to filter out constants with few outliers
invert grep