Add otapackage support for backuptool

Change-Id: I512554c579d444067cd3ccbb0e6946a5eb6bc964a

Conflicts:
	core/Makefile
	tools/releasetools/edify_generator.py
	tools/releasetools/ota_from_target_files
Fix up the recovery.fstab for adv recovery

Add options found in cm7 to allow for more complex recovery.fstabs with
multiple fstypes.

Change-Id: Id249c8f6766a1490a80fb3bd17bd7aa4e7dd9f2f
Allow low memory machine to build with a smaller java emulator.

This allows the default for 64 bit machines and adjusts the size
on lower memory machines. If you are on 32 bit you can't build
without this change, even using pae kernel with high mem.

Patch 5: found a better way to do this. Removed import string.
Change-Id: Iac1ef3b5db96029ca62897f6b64646bf6224e752
Modular backuptool.sh.  Executes backup and restore methods defined in arbitrary /system/addon.d/*.sh scripts.

* Copy backuptool.functions alongside backuptool.sh.
* Delete both from /system/bin as they are not useful there.

Patch Series
============
http://review.cyanogenmod.com/#change,13265
CyanogenMod/android_build
  * edify generator
http://review.cyanogenmod.com/#change,13266
CyanogenMod/android_system_core
  * permissions on /system/addon.d
http://review.cyanogenmod.com/#change,13267
CyanogenMod/android_vendor_cm
  * 50-cm.sh reference backup script
  * modular backuptool.sh
  * support backuptool.functions used by /system/addon.d/*.sh scripts

Change-Id: I26b4907d28f49c69627699d2accd2f0fa2d1b112

Conflicts:
	tools/releasetools/edify_generator.py
update ota_from_target_files to handle mounting/unmounting for backupscript

backupscript should not be mounting/unmounting itself as it makes other
scripts have unexpected results (such as modelid_cfg, which expects /system
to be mounted)

instead have the ota script handle the mounting/unmounting

Change-Id: I94511f4147c624d975cb3ecbeaa8b0e98f63437c