csvlook: Add max rows option

Created by: MichaelAquilina

I found myself needing an option to truncate to the top n rows often while working with CSV files. Example usage:

csvlook --truncate 5 < example.csv

The head command is not particularly suited got this because of the fact that you need to consider the first 3 lines are part of the header. While you could just stay manually adding 3 to your head argument each time I thought it would make more sense to just provide the option from within csvlook.