Released Version 3.18

Bug Fixes:

Fixed bugs with syntax-rules where:
- A literal identifier may not have been matched in a sub-macro if macro hygiene renamed the input.
- The environment of macro definition may be overwritten during expansion of a syntax-rules macro contained in another macro. This could cause macros defined in a library - but not exported from the library - to incorrectly fail to expand because they are not in scope.
for-each no longer throws an error when an empty list is received.
In compiled code, the let-syntax and letrec-syntax forms are now available to eval at runtime.
Added several missing I/O functions to the export list of the (scheme base) library.
bholst added Unpacker to the exports from Language.Scheme.Primitives, as it is required by unpackEquals.
bholst fixed many comments in the Haddock documentation.

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