Released Version 3.13

This release includes many enhancements to improve support for R⁷RS:

Added the command line flag --revision 7 (or -r7 for short) to allow huski and huskc to start in R⁷RS mode.
Added most of the standard R⁷RS libraries: (scheme base), (scheme char), etc.
Extended syntax-rules to allow another identifier to be used to specify the ellipsis symbol, per R⁷RS. For example, ::: could be used instead:
```
  (define-syntax and
    (syntax-rules ::: ()
      ((and test1 test2 :::)
       (if test1 (and test2 :::) #f))))
```
Added the following functions from R⁷RS: make-list , list-copy , list-set! , vector-copy , vector-map , vector-for-each , vector-append , string-map , string-for-each , string->vector , vector->string , vector-copy! , string-copy!

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