[MERGE] Build zip file from 'make dist' and document this; also tweak standard announcement mail

[John Arbash Meinel]

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Martin Pool wrote:
> It was recently requested by Eugene Wee that we build a source zip file.  They
> are indeed easier to deal with on Microsoft Windows if you don't have cygwin
> installed.  This changes 'make dist' to build one.
> 
> 

BB:approve

John
=:->

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