Infrastructure

commit 9af7205e5686443122d07767dce4d322986ab15f in tdf-bugzilla repo.

Adding graphviz to the bugzilla state dependencies and specifying a local graphviz (in /usr/bin/dot) provides graphs:
(e.g. https://bugzilla-test.documentfoundation.org/report.cgi?y_axis_field=bug_status&cumulate=0&z_axis_field=&format=bar&x_axis_field=version&no_redirect=1&query_format=report-graph&short_desc_type=allwordssubstr&short_desc=&product=LibreOffice&component=Writer&bug_status=UNCONFIRMED&resolution=---&longdesc_type=allwordssubstr&longdesc=&bug_file_loc_type=allwordssubstr&bug_file_loc=&keywords_type=allwords&keywords=&bug_id=&bug_id_type=anyexact&emailtype1=substring&email1=&emailtype2=substring&email2=&emailtype3=substring&email3=&chfieldvalue=&chfieldfrom=&chfieldto=Now&j_top=AND&f1=noop&o1=noop&v1=&action=wrap)

Looks like there are some limits on graph size -- we can see if we can tweak those later.