Log Message:
Update math/xlispstat to version 3.52.20.  Changes from version 3.52.18
include:

* Added some timing pauses so rotations and such are not too
  fast.

* Changed default setting of X11 option :FAST-LINES to NIL.  It
  is no longer needed as an optimization and support seems to
  now be buggy on some servers.

+ Support user-destdir installation.

+ HOMEPAGE has moved to uiowa.edu.