Sync

- Added Path::operator== for expanded path comparisons.  Why was
  that not already implemented?
- Added checks that the push/pull destination is not equal to
  rc.data.location.  That would be bad.
- Added comments, tweaked the wording on some messages.  Stubbed out
  confirmation of pull overwrite, while I think about it.

src/Path.cpp

@@ -66,6 +66,12 @@ Path& Path::operator= (const Path& other)
   return *this;
 }
 
+////////////////////////////////////////////////////////////////////////////////
+bool Path::operator== (const Path& other)
+{
+  return data == other.data;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 Path::operator std::string () const
 {