Verbosity: Fix "project" info not showing

- Make "project" verbosity imply "footnote", since verbose project
  info is shown using footnotes.  Fixes failing test in verbose.t.
- Convert "verbosity" variable to std::set for increased readability.

src/text.cpp

@@ -60,6 +60,25 @@ void wrapText (
     lines.push_back (line);
 }
 
+////////////////////////////////////////////////////////////////////////////////
+void split (
+  std::set<std::string>& results,
+  const std::string& input,
+  const char delimiter)
+{
+  results.clear ();
+  std::string::size_type start = 0;
+  std::string::size_type i;
+  while ((i = input.find (delimiter, start)) != std::string::npos)
+  {
+    results.insert (input.substr (start, i - start));
+    start = i + 1;
+  }
+
+  if (input.length ())
+    results.insert (input.substr (start));
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 void split (
   std::vector<std::string>& results,