function to remove a computer from a domai

Remove newslines from a string.

Recursively delete a directory, emptying all contents.

The method 'removeDoubles' uses a HashSet to remove double elements from a list without creating another list. The first occurrences of the multiple elements are kept, others will be removed. The order of the list will be preserved. The parameter list's iterator must support remove. Example of use is given in the main-method.