Remove all keywords that only apply to csv files since now the keywords can be applied with different values for each csv file read in

[timcera]

For "read" subcommand the "columns" keyword is trying to pull the listed columns out of each time-series read in. Since "read" is unusual, the "columns" keyword should apply to the output.

[timcera]

This is now a non-issue. Can now read in only particular columns of a csv, xlsx, wdm,...etc. file so shifting this issue to actually removing CSV specific keywords that now should be given as keywords for each CSV file.

Remove "columns", "skiprows", and "names", for example.

To use the keywords on the command line would be something like:

tstoolbox read test1.csv,4,5,skiprows=3,names=Fred,Wilma test2.csv,7,20,skiprows=10,names=Barney,Betty