Settings: Add support to enable/disable Electron Beam (2/2)

Parts were brought over from CM9 but not all of it.  This completes
the port.

Change-Id: I5ebfab22e68ea34e3babfaacd9c8103e25932d3d
No back icon in action bar of APN Settings

When entering the APN menu, the actionbar is missing a back
icon allowing the user to go back to the previous pane.

Added parentActivityName in ApnSettings, to enable action
bar back icon.

Change-Id: Iee8bb420f47c0e2c0d9a43739f534466abba30db
Merge "Settings: Add support to enable/disable Electron Beam (2/2)" into cm-10.1
Merge "No back icon in action bar of APN Settings" into cm-10.1
Settings: merge CyanogenMod

Change-Id: I1d965b7c44d0a0b7ba7d3f8edae3d221744629cb
Settings: revert Add support to enable/disable Electron Beam (2/2)

Change-Id: Ie7a1a718f3ea82c9abade97655092a6a8ff95194