SISC 1.8.6-rc released

SISC 1.8.6-rc (a release candidate) is released and available from the 
website.  This release fixes a handful of bugs found since the last 
stable release.  A couple of the fixes are invasive enough to warrant a 
release candidate before the next stable release (which would be 1.8.7).  

  * Stream (de)serialization is now tail recursive just as ordinary
    serialization.
  * Fixed problem dispatching to classes that existed only at release 
    time.
  * Fixed string comparison in SRFI 13
  * Fixed a space leak in serialization due caused by improper VLR 
    recycling in |apply|.
  * Fixed char-whitespace? which returned #f for #\return
  * Fix eval when used with strict-r5rs enabled.

	Scott  
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