More data usage chart iteration, app details.

Moved app details back into single Fragment to support animations and
template tabs.  Show the network in background behind app details
chart series to match designs.

Clamping sweeps at axis boundaries.

Bug: 4813014, 4598460, 4818029
Change-Id: I72c0b21ee1d595e4da31d293ae0dab9e801041f3