Log Message:
Update to 20060107.  Patch from Joerg Sonnenberger and minor fixes.

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.