Most noticeable changes (there's more than one year worth of them,
anyway):
* Potentially blocking status meters are now in a separate ion-statusd
program. Please write your additional status meters that do not monitor
the state of Ion itself for ion-statusd (and contribute them in the
Ion3 scripts repository at http://iki.fi/tuomov/repos/ion-scripts-3/).
For help on writing such status meters, see e.g. source for statusd_load
in ext_statusbar/ion-statusd.
* Line editor now supports history search; Control+Up/Down only scrolls
through history entries with matching initial part.
* Arbitrary winprop matching criteria is supported. Lua scripts have
access to X properties.
* So-called "placeholders". With the help of these the positions of
full-screen windows are remembered in their original frames, and don't
just get inserted after currently active window when returning from
full-screen mode. Under a session manager placeholders are also used
to remember the original order of windows.
* Experimental auto-show-completions support, which is also on by default
now. In this mode the Tab key can be used to cycle forward through the
completions, and Shift+Tab backwards. Modify the settings seen in the
new mod_query.lua to get normal Tab-completion, or change the completion
delay.
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