a) The Web.FastCGI module allowing Wrapl to be used for writing
fastcgi applications.
b) The syntax `expr` (with backquotes) which evalutes expr once at
compile time, instead of run time.
c) Better support for rationals, especially with regard to exponents
(e.g. 2 ^ -1 now returns 1/2).
d) The Util.Random module, for random number routines.