Test the constraint evaluation scanner/parser. Unlike the C++
implementation of OPeNDAP DAP2, the Java implementations use a scanner and
parser built from a single source file. This source file defines a LL(n)
grammar for the constraint expressions (where the C++ implementation
defined a LALR grammar).
The CE tester must be envoked with one of the following options:
-s to test the scanner
-p to test the parser