detect_drift() implementation based on #67 and #70.detect_temporalchanges() glags everything from start until the decay is below 5.detect_outliers(), detect_levelshifts() and detect_temporalchanges() for gwloggeR::apriori("hydrostatic pressure") data based on v0.06 (#35).detect_outliers() function now has a plot = TRUE argument which prints diagnostic plots (#26).