[LightDM] 0.9.0 (beta) release

[Robert Ancell]

Hi all,

I've just released LightDM 0.9.0.  This represents a large number of
changes from the 0.4 series, but the good news is now the interfaces
can be considered stable (both libraries have bumped version number
from 0 to 1).  Any breaks in configuration/API/ABI will be considered
high priority bugs.

Some highlights:

* You don't need to run with a configuration file (this was true
before but more settings are now set to sane defaults).

* The default session is 'default' so consider setting it differently
at compile time, setting the default in the config or making a
default.desktop symlink in /usr/share/xsessions

* Greeters are now treated the same as X sessions and are loaded from
/usr/share/xgreeters.  Some information is provided to greeters via
hints (which are retrieved from liblightdm).  If you are writing a
greeter and it needs additional configuration create a config file
/etc/lightdm/greeter-name.conf.

* Multi seat is supported by adding an entry in
/etc/lightdm/lightdm.conf with the form [Seat:seat_name].  Dynamic
multi-seat is planned for 0.9.x.

* Guest account works by looking for a program 'guest-account' in the
path.  It works by calling 'guest-account add' to create new accounts
and checks for the last line of stdout for the username.  Accounts are
removed with 'guest-account remove username'.  I'd like this to go
into the AccountService project at some point.

* The seats and sessions are exposed on the D-Bus object
org.freedesktop.DisplayManager.  You can use this to switch users.  In
0.9.x there will be an environment variable XDG_SEAT_PATH and
XDG_SESSION_PATH to make it easier to work out which seat/session to
use.

Where to now:

* I haven't got a schedule for exactly when 1.0 will be released, but
as Ubuntu is the primary consumer I expect it to tie in with the
Ubuntu 11.10 release.

* The plan is to have a 6 monthly release cycle (matching
GNOME/Ubuntu) and have a stable/unstable branch (i.e. 1.1.x will be
unstable, 1.2.0 will be the next major release).

Sorry for just abandoning bugs/feedback while I made this big release,
I'll catch up on it all now!

--Robert