[LightDM] LightDM feature summary

[Robert Ancell]

In case anyone was wondering what version of LightDM they should run / when
to update here is a list of new features between each supported release.

1.2
- Oldest supported release
- Support ends April 2017

1.10
- logind support
- Multi-seat support through logind if logind-load-seats=true
- Removed lightdm-set-defaults (use configuration snippets) and
gdmflexiserver (use dm-tool)
- Mir sessions and greeters supported
- Remote sessions
- Background automatic logins (i.e. login while still showing greeter)
- Run greeters through lightdm-greeter PAM service
- Memory so it can't be paged to disk
- Unity System Compositor can be used as a session switcher
- Greeter wrapper option
- Sessions can be loaded from /usr/share/lightdm/sessions and greeters from
/usr/share/lightdm/greeters
- Configuration option for Xvnc command
- Script hook for when displays stop
- Guest session wrapper script
- Support multiple seat types, falling back if one fails
- Shared data between greetes and sessions
- Log records to wtmp and bmtp
- Guest session can be configured
- User switching can be disabled
- Do a timed autologin each time you are returned to the greeter
- PAM services configurable
- Support ends April 2019

1.14
- Multi-seat support through logind by default
- Multi-seat configuration can use section names with glob matching (e.g.
[Seat:usb-*])
- Greeter can continue to run in background (speed up switching)
- Support ends January 2016

1.16
- Deprecate [SeatDefaults] configuration section (use [Seat:*])
- Use IP address of XDMCP requests to contact X server if available.
- Add an option for XDMCP and VNC servers to only listen on one address.
- Wayland sessions / greeters supported
- Support ends July 2016
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