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 lamvbertw-1.1 as wip/lambertw.

The Lambert W( x ) function and its possible applications in physics are
presented. The actual numerical implementation in C++ consists of Halleys and
Fritschs iterations with initial approximations based on branch-point expansion
asymptotic series, rational fits, and continued-logarithm recursion