Move cmdtable and reposetup handling out of extensions.py
A new function (extensions.extensions) allows the code that is
interested in those attributes to handle them directly.
This allows some cleanups of extensions.py. Notably, we can
remove the extensions.commandtable hack.
It also makes it easier to add standard extension attributes,
like a "hgwebsetup" function or a "helptable" dict that augments
the data in help.py, etc.
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diff -r 48b371597640 -r acea2ab458c8 binfile.bin
Binary file binfile.bin has changed
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diff --git a/binfile.bin b/binfile.bin
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