cvsutil: Clean CVS checkout working files or safely change CVS/Root

List the specified types of files and safe settings of CVSROOT for already checkouted package. As an example of its many applications can serve a handy prevention of grepping built files: grep -w wanted_sym `cvsfiles`

There already exists package CVS Utilities with similiar features - this utility should be merged into it. Pointed out by the courtesy of Jesse Glick.

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