viv: dump QWebView-derived MemCanvas classes to HTML files (Memory View

and FuncGraph View and Symboliks View).  Sadly, we can't currently
easily do this for the CallGraph or Tree Views (eg. Functions, Workspace
Names).  perhaps the TreeViews will be added later.  not sure about
CallGraph, it's a different animal altogether.
what's up with the hard coded 50 offset stuff here?