Better error handling for parsers.
Checking for a non-empty list in expand-docs.
Factoring print-module-docs and print-module-binding-docs into (chibi doc).
Adding @help to (chibi repl) to lookup online docs.
Render parameter in print-module-[binding-]docs can be made #f for the default.
Generating lib docs in html format.
Handling raw numbers in sxml format.
Default test comparator should require same exactness.
Fixing exactness in square test.
Max and min should coerce to inexact if any argument if inexact.
Fixes issue #178.