Thanks for reporting all these things! - the undo is now ok with the "swap" buttotn - you can "hammer" the increment/decrement buttons - the error messages a

Thanks for reporting all these things! - the undo is now ok with the "swap" buttotn - you can "hammer" the increment/decrement buttons - the error messages are a bit better ('integer expected' and not 'number expected'). What do you mean by "better all around", what do you think of? - west/east only shadows are possible - the title is now a link Thanks!