templater: add new docheader/footer components for XML (issue4135)
The existing header/footer components were templated per-changeset,
and thus couldn't be correctly printed for an empty log
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
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Basic install:
$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
Running without installing:
$ make local # build for inplace usage
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