Harm bug fixes

See merge request !19

redetermined interpolation behaviour for frequency aligned values, seperated by a margin exactly sized 2*freq

     the output dataset

        flagger.setFlags method

Executable: Add the DMP-Flagger

See merge request !18

        pd.DataFrame

Python3.8

See merge request !16

reader update

See merge request !15

        were not available in flagger based dsl function (e.g. isflagged)

replaced offset string utilization by real Offsets to circumvent freqstring-offsetstring uncoherence