Added global makeLogTag function to ensure tags are 23 characters or
less. Android has a soft limit on this of 23 characters, and depending
on the logging function used, it may or may not enforce this limit.
onDestroy, cancel the alarm
Change isSupported -> isSupportedOnThisDevice, and make
isSupportedOnThisDevice use the existing mTelephonyManager if available.
Merge pull request #1243 from garvankeeley/cellscanner-move-null-check

Sync Fennec code with stumbler github