Many little changes to get rid of compile-time warnings.

There now should be no warnings when compiling on LINUX. YMMV elsewhere.

connections/gvretserial.cpp

@@ -9,9 +9,9 @@
 #include "gvretserial.h"
 
 GVRetSerial::GVRetSerial(QString portName, bool useTcp) :
-    CANConnection(portName, "gvret", CANCon::GVRET_SERIAL, 3, 4000, true),
-    useTcp(useTcp),
-    mTimer(this) /*NB: set this as parent of timer to manage it from working thread */
+    CANConnection(portName, "gvret", CANCon::GVRET_SERIAL, 3, 4000, true),    
+    mTimer(this), /*NB: set this as parent of timer to manage it from working thread */
+    useTcp(useTcp)
 {
     sendDebug("GVRetSerial()");