Fixed nonfunctional node delete. Was due to trying to find node by name but

passing in the name and comment concatenated together.  Made a new function to
find by name+comment since extracting only name from the text in the column would
require too much guessing.

dbc/dbchandler.h

@@ -72,6 +72,7 @@ public:
     DBCFile(const DBCFile& cpy);
     DBCFile& operator=(const DBCFile& cpy);
     DBC_NODE *findNodeByName(QString name);
+    DBC_NODE *findNodeByNameAndComment(QString fullname);
     DBC_NODE *findNodeByIdx(int idx);
     DBC_ATTRIBUTE *findAttributeByName(QString name, DBC_ATTRIBUTE_TYPE type = ATTR_TYPE_ANY);
     DBC_ATTRIBUTE *findAttributeByIdx(int idx);