New function:   motif-map map sequence &key otherwise swallow   [Function]   Arguments and Values:   map                    a list. (<old><new>). sequence        a proper sequence. otherwise       NIL or an argument. The default is NIL. swallow         NIL or T. The default is NIL.   Description:   MOTIF-MAP returns a copy of sequence in which each motif that has been mapped is replaced with a new motif.