createflagmad: Creates Flag for Outliers Based on Median Absolute Deviation
In treenet/treenetproc: Clean, Process and Visualize Dendrometer Data

createflagmad creates flag for outliers that are above or below a threshold distant from the first or third quantile. The threshold is specified by the the median absolute deviation (mad).

1	createflagmad(df, reso, wnd, tol, save_thr, frost_thr, correction)

`df`	input `data.frame`.
`save_thr`	logical, specifies whether the applied thresholds are saved for later plotting or not.
`frost_thr`	numeric, increases the thresholds for outlier and jump detection in periods of probable frost (i.e. temperature < `lowtemp`). The thresholds are multiplied by the value provided.