tests/test-clone-cgi.out

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.

% initialize repository
adding a
% try hgweb request
0
1f424bb22ec05c3c6bc866b6e67efe43  page1