1.6d20 release

[James W. W. <os...@jw...>]

I made drafts of the SDKs:

<ftp://ftp.frameforge3d.com/misc/quesa_1.6d20_sdk_win32.zip>

<ftp://ftp.frameforge3d.com/misc/quesa_1.6d20_sdk_mac.sit>

As for the source releases, I suppose we should regenerate the API 
reference from the headers.  I tried running the DoQuesaDocs.pl script, 
and nothing happened.  No error message, no docs.  Anyone know how this 
is supposed to work?
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