debugdiscovery: allow to select random seed during debugdiscovery run
The randomness can lead to large timing difference, controling it is important.
Mercurial
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Mercurial is a fast, easy to use, distributed revision control tool
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$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
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Running without installing::
$ make local # build for inplace usage
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See https://mercurial-scm.org/ for detailed installation
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