Add gesture based lockscreen security. [2/2]

PS2:
Tidy things up a bit.

Change-Id: I83e3ab643e19b2a2d9c8416f4925bbab05bbc896
Dont enable Wi-Fi if it's not toggleable in flight mode

Dont enable Wi-Fi if it's not toggleable in flight mode
by restoring the return which was removed by
e78c1879058571c00879f0d3e756951302adf513

Change-Id: I8ca5a3e9b3f36f148f08ce97b8a2b854bf7de21c
Clamp date setting for the SetupWizard as well as Settings.

We fixed this for Settings in 7ccfa0614caeba8eba5d3040a90541a24fa1e6c9,
but @sonymobile.com point out that it's still broken for SetupWizard.

Change-Id: I59348200105246f3ed7c0892e5f19b901d3e95ac

Conflicts:
	src/com/android/settings/DateTimeSettings.java
Storage Settings: Allow user to trigger a volume rescan

This change allows to trigger a rescan of a volume with the next restrictions:

- Internal volumes if they are emulates
- Primary volumes
- Non-Removable volumes

Requires http://review.cyanogenmod.org/#/c/44585/

Change-Id: I42aebc9fc0d3530cf0a3efb4d2139b688707d43d
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>