Add DivePlannerSummary, a page to show in dive centers.
Allow user to select period for the 2 colums in DiveSummary.
Default is "Total" and "3 month", but allowing the user to change
these, make it a very simple tool to view how the user progresses.
Variables are taken from Backend.
[Dirk Hohndel: adjusted text strings as these aren't really months]
Signed-off-by: jan Iversen <jan@casacondor.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
