graphlog: split the actual DAG grapher out into a separate method
This allows extensions like pbranch to use asciigraph() to graph dependencies
for patch branches, but could be used for basically any DAG.
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
created new head
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% Conflicting rebase
merging common
warning: conflicts during merge.
merging common failed!
abort: fix unresolved conflicts with hg resolve then run hg rebase --continue
% Abort
rebase aborted
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o 1: C2
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o 0: C1