install blockdiag family on t.e.o.
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as a picture says more than a thousand words every so often, i'd like to propose making blockdiag, seqdiag, actdiag (not sure about nwdiag) available for use on t.e.o.
for existing things, stuff like wiki:TracDev/RequestHandling would actually perhaps become maintainable.
for new content, i think this is a big barrier drop for having illustrations available for technical documentation, for example when trying to collaboratively figure out stuff with complexity levels of wiki:TracDev/Proposals/UserSystem.