SISC 1.8.4-rc Released

SISC 1.8.4-rc is now released and available at the usual spots.  This is 
a release candidate.  As such, we'd appreciate that users pound on this 
heavily, as barring any newly discovered bugs, we will release 1.8.4 
stable in a week or two.  This release fixes a number of bugs, a few of 
them fairly serious:

  * Fixed a continuation invocation bug introduced by a bogus
    optimization in 1.8.1-alpha.
  * Fixed a misuse of the vlr capture flag that was resulting
    in bad lexical environment recycling, ultimately crashing the REPL.
  * Fixed a bug in parameterize where multiple body expressions weren't
    allowed.
  * Changed SRFI-18 to use the SRFI-19 time datatypes.
  * Upgraded SRFI-19 to the latest reference implementation which
    contains many bug fixes.
  * Fixed identifier generation in nested modules which were
    causing collisions.
  * Introduction of explicit syntax tokens (a low level feature which 
    will allow us to simplify the global environment and fix a 
    redefinition bug in the future).

  Enjoy!

	Scott

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