[PATCH 5 of 5] templater: add parsing and expansion rules to process "templatealias" section

[Sean Farley]

Yuya Nishihara <yuya at tcha.org> writes:

> # HG changeset patch
> # User Yuya Nishihara <yuya at tcha.org>
> # Date 1459078316 -32400
> #      Sun Mar 27 20:31:56 2016 +0900
> # Node ID 08da136a18335f677751512883156d3f246bb3c7
> # Parent  6e60bc44a476c227925491d6cf3ac1571016574e
> templater: add parsing and expansion rules to process "templatealias" section
>
> The debugtemplate command is updated to show expanded tree, but still the
> template engine doesn't support alias expansion. That's why the test says
> "parse error" for now.

After going through this a few times, I really like it. Unifying the
engine implementation is noble and I don't see any problems from this
series.