Solve Exercise 5-18: error-recovering `dcl`

This exercise was a real pain in the ass. The original use of
getch() and ungetch() was inferior to a line-based approach. It
really doesn't seem like the way a parser should be built, but
it taught me a little about the order of recursion. I'm convinced
that a debugger is necessary if you want to build a good parser.

This implementation doesn't recurse in a natural way, or even
enough to stack data type prefixes. Hopefully by the time I get to
5-20 I'll have enough ideas to implement something that *does*
recurse well.

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