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Implement feature request #1947327; link the documentation for RANDOM to RERANDOM.

While I was at it, I described how RANDOM works, so that programmers will understand what setting the random seed does.

This commit was manufactured by cvs2svn to create tag 'VER-6-20-0'.

Update one more time for the 6.20.0 release. I found a bug late in my test pass and added a new regression test for it.

Add some more tests for FOREACH to catch a regression in pacturtle that I introduced when I fixed #1669735.

Try another fix for bug #1669735. The previous fix had some problems when the data list was a variable and it output something. I think the problem was not with my fix, per se, but that my fix hit a different bug in RUN.

This fix is a little slower, but it seems to work around the other bug in RUN.

Update the expected test log based on the results from 6.20.0.

Update the expected version for the 6.20.0 release.

Fix some problems where the value of ERROR was leaking through to other tests can causing false-positive test failures.

Add in the changes for 6.20.0 for the next release.

Bump the version to 6.20.0 for the next formal release.