plot_calib_data: removed sclk as index,
changed styles of markers
changed lookup of el_cmd to isin
label_calibdata: renamed parameter cdet to df
cleaned up
get_grouped: added moving parameter
deleted calc_gain
added definde_sdtype (science datatype)
removed storing of df in DivCalib class
adding get_calib_block member
adding CalibBlock class
notebooks: wip
cleaning up in define_sdtype
adding add_view_booleans
indexing timed as well by c and set
commuting out bb_cols and nrad temporarily, bb_cols don't work with multi index
cleaning up in CalibBlock class