changelog: lazily parse user
Same strategy as before.
Revsets not accessing the user demonstrate a slight performance win:
desc(bug)
0.887169
0.910400
0.895514
date(2015)
0.878797
0.870697
0.820987
extra(rebase_source)
0.865446
0.841644
0.823811
date(2015) or branch(default)
0.968276
0.945792
0.910981
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
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