The code for handling character constants
in datalists in ncgen has some problems.
1. It failed on large constants
2. It did not handle e.g. var = 'a', 'b', ...
in the same way that ncgen3 did.
3. The code for generate.c and genchar.c needed
some refactoring to make it a little simpler
(but not simple).
naming convention.
o Modified ncdump shell, test scripts so that the extra
digit in an exponent on windows wouldn't be a problem.
o Modified configure.ac to check for the zlib dll provided
by the zlib group; they recommend using the official dll for
windows builds.
