Add infobar option to disable the message line

Fixes #257

cmd/micro/tab.go

@@ -31,7 +31,12 @@ func NewTabFromView(v *View) *Tab {
 
 	w, h := screen.Size()
 	t.tree.width = w
-	t.tree.height = h - 1
+	t.tree.height = h
+
+	if globalSettings["infobar"].(bool) {
+		t.tree.height--
+	}
+
 	return t
 }
 
@@ -49,7 +54,12 @@ func (t *Tab) Cleanup() {
 func (t *Tab) Resize() {
 	w, h := screen.Size()
 	t.tree.width = w
-	t.tree.height = h - 1
+	t.tree.height = h
+
+	if globalSettings["infobar"].(bool) {
+		t.tree.height--
+	}
+
 	t.tree.ResizeSplits()
 }