Copies the file designated by the non-wild pathname designator FROM to the file designated by the non-wild pathname designator TO. The following keyword parameters are supported: * :if-exists this can be either :supersede or :error (the default). If it is :error then a source/target-source-does-not-exist-error will be signaled if the FORM pathname designator does not exist. * :if-does-not-exist this can be either :ignore or :error (the default). If it is :error then a source/target-target-already-exists-error will be signaled if the file designated by the TO pathname already exists.