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.h

@@ -39,6 +39,7 @@ public:
   virtual ~Path ();
 
   Path& operator= (const Path&);
+  bool operator== (const Path&);
   operator std::string () const;
 
   std::string name () const;