include plot script restructuring

added 12 commits

317f2446 - split plots into abstract, pre, and postprocessing plots
175841d5 - moved availability and station map to preprocessing
ab5136ae - periodogram plot is included in preprocessing plotting for first time
8f2b1be9 - added overall plot including all variables
95688d30 - added short description
37c6a279 - PlotPeriodogram now can plot periodogram before and after filtering
8e40c948 - moved plotting back from preprocessing to postprocessing to have a single...
e664f716 - added legend
da4d59e9 - added sample plot into docs
26fbafb8 - can be merged now on test pass, /close #
35b5308b - fixed legend position /close #298 (closed)
2db5aa0e - Merge branch 'lukas_issue298_feat_periodogram' into 'develop'

enabled an automatic merge when the pipeline for 2db5aa0e succeeds

merged

mentioned in commit fcec60ca

Merge request reports