revset: use appropriate predicate name in error messages
"extinct" and "unstable" predicates use "obsolete" implementation
internally, but own predicate name should be used in error messages of
them instead of "obsolete".
Mercurial
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Mercurial is a fast, easy to use, distributed revision control tool
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$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
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