Volcano plot: select the columns based on colnames instead of position

[KristinaGomoryova]

Hi! I would like to ask whether in the volcano plot tool it would be possible to change the columns selection for the pvalue/FDR/logFC/labels based on colnames rather than the position of column within the table - if the table is rather large, it's a bit impractical to count the columns to find the correct ones :)

Thanks for consideration!

[KristinaGomoryova]

ping @hechth