Add internal `cons2list' utility routine
Fix small gc issue (thanks valgrind)
Implement `apply'
README: document existence of `list-ref'
Write `list' as a lisp routine rather than a special form
Implement `odd?', `fold-right'
fix symbol collision issue in prefix code
Fix bug in `reverse'
Implement `even', `filter'
Fix bug in `filter', implement `map'
Add parser support for quasiquotation and related escapes
update TODO
Fix `filter' again
GUI: about box: show build date and originating commit