Brings [teacup] itself up to date.

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[MHo] 2014-03-25: Active Tcl 8.6.1 at home, 32 bit, no problem. Active Tcl 8.6.1 at work, 64 bit:
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C:\Windows\system32>teacup update-self
Updating D:/home/Hoffmann/Programme/Tcl/bin/teacup.exe ...
Not found in the archive.
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How can I update teacup.exe, then?


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