New compiler optimizations, particularly access to global lexical variables.
File compiler now conveniently propagates hash bang line from source file to compiled file, and that hash bang operation is supported in compiled files.
Top-level forms treated more incrementally by evaluator and compiler. This means that for instance we can compile (progn (defmacro foo ()) (foo)) as a top-level form. The sub-forms are expanded and compiled separately and sequence.
New functions in library: random-float, signum and others. Floating-point rounding control exposed, if available in host platform.
Fixed bug in compiler's treatment of nil test in (for ...) loop.
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