Storing track points independently from their tracks (#3). Also adding some basic tests for gpx database operations.

src/theme/variables.css

@@ -1,12 +1,11 @@
 /* Ionic Variables and Theming. For more info, please see:
 http://ionicframework.com/docs/theming/ */
 
-#background-content {
-  background: transparent;
-}
 
 /** Ionic CSS Variables **/
 :root {
+
+  /** Transparent background so that underlying tiles and whiteboard can be seen **/
   --ion-background-color: transparent;