SISC 1.13.1-rc Released

SISC 1.13.1-rc is released and is available from the SISC website.
This release fixes a number of major and minor bugs found in the
previous alpha.  Thanks to all who spotted bugs and provided
suggestions.

As a release candidate, this build could become the stable release
if no issues are found, so this is the last good chance to pound
on the release before trusting it in production code.  So
happy hunting!

	Scott

Changes:

* Converted side-effecting primitives to non-fixable procedures,
  fixing bug 1448235.
* Genericized the process (os module) ports.  See bug 1448191.
* Fixed a bug in |expand-file| that resulted in source location
  annotations to be produced for the first expression only. See
  bug 1455502.
* Fixed error reporting in records module. See bug 1454411.
* Fixed a bug that caused invocation of error continuations to be
  rather unpredictable. See bug 1453863.
* Fixed several bugs in optimistic expressions triggered during
  unoptimisation.  See bugs 1448023, 1448219.



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