Feature: Add option to constrain number of lines in each column

[timob]

This would mean an ulimited number of columns, regardless of terminal width.

The same effect is possible now by specifying a large --width argument. But is not easy to get ouput with a specific number of lines.

The whole point of this is to pipe into less and then use the right arrow key to display all the columns.

[timob]

-W options does this