defineBufferCoords: Determines buffer wells coordinates on a plate
In HelBor/wpm: Well Plate Maker

function to place the buffer solutions on the plate according to the selected mode: it generates a dataframe containing the row and column coordinates for each buffer solution.

1	defineBufferCoords(p_lines, p_cols, mod = "none", start_buffer)

`p_lines`	number of rows on the plate
`p_cols`	number of columns on the plate
`mod`	character, can be "none", "by_column", "by_row" or "checkerboard"
`start_buffer`	character, "even" means that the buffers will be positioned on the even rows of the plate. Otherwise, they will be positioned on the odd rows.