lipids-class: parsing the raw experimental data
In GitShepard1/lipidtools:

This combines head with a number of columns

`filename`	tsv filename
`lipid_class`	filter data by lipid class e.g. FFA or LPL
`selected_chains`	filter data by selected_chains e.g. 10:0 etc
`treat_groups`	filter data by treatment groups
`columns`	declare columns which contain experimental subject data e.g. M1, M2, etc for mouse 1 etc.
`filter_method`	apply outlier removal e.g. mf+replacemedian for median filtering and median replacment by default.
`filter_cutoff`	outlier removal cutoff which is 2 by default