lamdevhs

Fixes #1280. It's my first PR, do tell me if I've done something wrong or if something is missing. :)

csvcut throws exception if you give it columns that don't exist; feature request: add option to ignore columns that don't exist

3

...or perhaps just make it the default behavior? As it stands the tool is 100% unusable if you don't know the columns you want to remove (or show for that...