SpamBayes 1.1a6 source release

I created a 1.1a6 source release for SpamBayes to match Mark's Windows
installer.  It is available here:

    https://sourceforge.net/projects/spambayes/files/

Click the 1.1a6 folder to get at the files.

Mark, can you put your Windows installer there (or point me at it and I'll
stick it in place)?

I moved the 1.1a2 and 1.1a3 folders into the OldFiles folder (not visible
except to the project admins).  I left 1.0.4 and 1.1a4 in place, but people
should generally be using the 1.1a6 release unless it's demonstrated to have
significant problems.

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