docs: def delete(expnum, ccd, version, ext, prefix=None):
      """
      delete a file, no error on does not exist
  
      @param expnum:
      @param ccd:
      @param version:
      @param ext:
      @param prefix:
      @return:
      """
      uri = get_uri(expnum, ccd=ccd, version=version, ext=ext, prefix=prefix)
      remove(uri)