Bug 792833 - User specifies source of 'num' field'; either...

transaction number or split action (requires at least GnuCash 2.5.0)

Strip leading delimiters from KVP keys when reading them from the
database. Leading delimiters are incorrectly included in databases
created with GnuCash 2.6.x.

libgnucash/backend/sql/gnc-slots-sql.cpp

@@ -203,7 +203,7 @@ get_key_from_path (std::string path)
     auto idx = get_final_delim(path);
     if (idx == std::string::npos)
         return path;
-    return path.substr(idx);
+    return path.substr(idx + 1);
 }
 
 static std::string