Log message:
Drop superfluous PKG_DESTDIR_SUPPORT, "user-destdir" is default these days.
Mark packages that don't or might probably not have staged installation.

Log message:
Import symmetrica-2.0 as wip/symmetrica.

Symmetrica is a collection of routines, written in the programming language
C, through which the user can readily write his/her own programs. Routines
which manipulate many types of mathematical objects are available. Their use
is facilitated by Symmetrica's object oriented style.