[Nickle]Slight new stuff, error message buglet

[Bart Massey]

max and min builtins have been added to Nickle now.
Functional syntax, one or more arguments.

A libc "ctype" lookalike has been added.  ASCII-only, which
is a bug: should be Unicode.  Namespace Ctype, the obvious
functions.

Error message buglet:

  ->     while (!a[na - 1])
  polynomial.5c:66: Incompatible type, value 'coefficient', for u^A operation

The error is correct, the message needs help.  I will let
Keith chase through the parse tree forest.

	Bart