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Pack prolog_library_collection -- prolog/dlist.pl
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 dappend(+Ls:list(dlist), -L:dlist) is det
 dappend(+L1:dlist, +L2:dlist, -L3:dlist) is det
 dappend_to_list(+DLs:list(dlist), -L:list) is det
Append an arbitrary number of difference lists into one regular list.
 dappend_to_list(+DL1:dlist, +DL2:dlist, -L:list) is det
Append two difference lists into one regular list.
 dlist_to_list(+DL:dlist, -L:list) is det
Converts a difference list into a reggular list.
 is_dlist(@Term) is semidet
Succeeds if `Term' is a difference list.