beautifygraph: don't substitute anything for 'X' in rendered graphs
It looks like we never actually render graphs this way, although there's an
example in a comment next to the code that prevents it from being needed (see
graphmod.ascii()).
Differential Revision: https://phab.mercurial-scm.org/D5103
Mercurial
=========
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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