Functions Regrouping

I want to Regroup / get in order functions module - because we nearly have reached the points where drawer labels and drawer content have diverged to a confusingly degree - this is also a step on the way to make saqc accessible/understandable for going to be users.

I would suggest the following new division:

(For existing modules, i only listed functions newly going there, by marking them with "+".

Tools (technical tools)

drop
rename
mask
fork
clearFlags
FlagForce
flagDummy
flagGood
flagManual
flagGeneric
flagMissing
flagIsolated

modelling (replace values by residues or clusterlabels)

polyFit
rollingMean
ChangePointCluster
driftcluster ()

processing (aka "proc" - calculate new values for existing indices)

interpolateMissing
transform
procGeneric
ExpDriftCorrecture
offsetCorrecture

regularization (mappings that transmit between regular and raw timeseries indices)

interpolateGrid
resample
shift
projectFlags (deharmo basically)

harmonization (pure wrapper, connecting tools and regularization functions)

shift2grid
linear2grid
aggregate2grid

spikesDetection -> outlier_detection (flag pikes or outliers)

flagRange
flagSeasonalRange

patternRecognition -> pattern_detection

flagPattern

breaks_detection

flag_RegimeAnomaly

multivariate_flagging (calculate flags from comparison of different timeseries)

flagCrossScoring
flagDriftFrameNorm
flagDriftFromReference
flagDriftFromScale
stray

Besides some clarification of what is the difference and purpose of processing/modelling/harmonization functions, the suggestion mainly features a split of the infamous functions module - there now is the tools module, wich, as you might notice, still contains a lot of quite different functions. One could think of further seperating it into flagging_tools and something like config_tools - dont know.

It would be nice if everyone could have a look into and give a brief statement of approval/dismission, since the organizational randomnes of the functions makes me increasingly nervous.