Code review comment for lp:~zorba-coders/zorba/fix_bug_962255

Ok, I have added the changes discussed. xqdoc now depends on modules_svg (Sorin, you had it the other way around, but I think this is what you meant). modules_svg will be a dummy target if the Graphviz modules is not declared. If it is declared, it will generate the .svg file.

I'm voting Approve on this change. Sorin, you should inspect my changes and, if they seem OK, go ahead and mark the proposal Approved to run it through the queue.