squashed_ro_rootfs pack recipe: also pack /sh
fs/disk: comments
liram, squashed_ro_rootfs layout: unpack /sh

optional tarball
lib/: add liram directory
make liram-manage modular / move to lib/

+ liram-manage works with fs/packlib now
liram-manage, pack: properly unmount the sysdisk

atexit catched this issue, but unmounting the disk before releasing the lock is
the propery way.
lib/liram/manage: add script vars

* LIRAM_MANAGE_X_UPDATE_CORE
* LIRAM_MANAGE_X_UPDATE_KERNEL
liram-manage: --update-core

Fetch core images from the build/image host using a _custom_ helper script
(not included in liram-manage).
lib/liram/manage: fix typo

+ add unmount function aliases to avoid this issue
fix liram-manage, pack
liram/manage/mount: log mountpoint
liram-manage: (un)mount with -M/-U