Stats:

- Refactor handling of required stats
    - Shorten description of required stats
    - Improve save messages on configstats.jsp
    - Change bw.sendBps and bw.receiveBps stats to bytes, not Kbytes
    - Expires directive for graphs

apps/routerconsole/java/src/net/i2p/router/web/StatSummarizer.java

@@ -258,7 +258,7 @@ public class StatSummarizer implements Runnable {
         if (txLsnr == null || rxLsnr == null)
             throw new IOException("no rates for combined graph");
 
-        long end = _context.clock().now() - 60*1000;
+        long end = _context.clock().now() - 75*1000;
         if (width > GraphHelper.MAX_X)
             width = GraphHelper.MAX_X;
         else if (width <= 0)