dpi improvements for small text

- word-wrap and style the log message at the bottom, this should fix
  clipping of error messages down there
- introduce units.smallPointSize, which defines a small font size to use
  for toned-down display elements (e.g. the date in the dive list)
- No need to assign the default value to Text.text

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

qt-mobile/qml/DiveList.qml

@@ -62,6 +62,7 @@ Rectangle {
 					text: date
 					opacity: 0.6
 					color: theme.textColor
+					font.pointSize: units.smallPointSize
 					anchors {
 						right: parent.right
 						top: parent.top