More compact controls

The controls in the sidebar are inconsistent; the interval
selector has no spacing or border for a clean look.

This patch updates LTMTool and TrainTool to be more
efficient with the limited space.

A more extensive update is still required to unify all the
chart controls look and feel and get rid of the clunky
layouts with ugly wide buttons.

src/LTMWindow.cpp

@@ -49,7 +49,10 @@ LTMWindow::LTMWindow(MainWindow *parent, bool useMetricUnits, const QDir &home)
 
     // the controls
     QWidget *c = new QWidget;
+    //c->setContentsMargins(0,0,0,0); // bit of space is helpful
     QFormLayout *cl = new QFormLayout(c);
+    cl->setContentsMargins(0,0,0,0);
+    cl->setSpacing(0);
     setControls(c);
 
     // the popup