Fix use of TARGET_USE_CUSTOM_LUN_FILE_PATH

TARGET_USE_CUSTOM_LUN_FILE_PATH is already available as a
string to extendedcommands.c, regardless of whether it is
quoted or unquoted in BoardConfig.mk.  Removed STRINGIFY define
because it is already available in common.h (along with EXPAND
which shoud be used instead of STRINGIFY anyways).

Change-Id: I3f4ab8d1529df240c200e44049fc60519c0afd5b
UI text corrections

Change-Id: I3833941e4ef81cbb99a3042b343ce689bf60305f
Merge branch 'cm-10.1' of github.com:CyanogenMod/android_bootable_recovery into cm-10.1