Update /etc/timezone in enter-chroot, by guessing its value from
the current /etc/localtime.
Add -T to the creation of /etc/localtime symlink, in the unlikely
case where /etc/localtime is a directory.
Revert "Update /etc/timezone in enter-chroot, by guessing its value from"

After discussion, updating /etc/timezone is not necessary, and even
possibly harmful, as Ubuntu would erase /etc/localtime upon tzdata
upgrade if /etc/timezone exists.

This reverts commit 94566f369f2e34ca2688b8584ff3c6955561b131.
Document why we are removing /etc/zoneinfo from the guest OS.
Check that the link /etc/localtime points to is a valid timezone in the guest OS.
Simplify timezone sanity check.
ChromeOS -> Chromium OS
Properly copy symlinks when installing files.
Add double-e parameter to mount-chroot to change the passphrase.
Support passing two -e's to the installer.
Add edit-chroot command for managing chroots.

delete-chroot is now just a symlink to edit-chroot.
Don't chmod copied symlinks.
Move ubuntu to separate directory.
New wrapper installer script.
First working Arch Linux version. More testing needed.
Support for "touch" target.
Install croutoncursor.
Fix croutonwheel by using mawk (Arch uses gawk by default).
Fix startxfce4 on host by adding /usr/local/bin in /etc/login.defs
Updated installer.