remotenames: add functionality to hoist remotebookmarks This patch adds the functionality to hoist remotebookmarks to the top level namespace. The peer of which bookmarks should be hoisted can be set using `remotenames.hoistedpeer` config option. Only bookmarks can be hoisted. If a hoisted name and local bookmark exists of the same name, the local bookmark takes precedence. While I was here, I documented the default values of two other remotenames config options. Differential Revision: https://phab.mercurial-scm.org/D2807

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#require clang-libfuzzer test-repo

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  $ cd $TESTDIR/../contrib/fuzz

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  $ make

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Just run the fuzzer for five seconds to verify it works at all.

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  $ ./bdiff -max_total_time 5