Patch: tal:define="local var expr"

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Here is a patch that localizes tal:define=3D"local var expr", as in TAL.
It leaves unspecified defines as global.
It adds <=3Flocal name=3D"var"=3F> ... <=3Fend=3F> to the canonical syntax.
Also, some oddities in repeat loops are cleaned up by localizing, and
some vars are properly quoted in code.

-Jeff

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