* bus/config-parser.c, bus/bus.c: implement <servicedir> and
<includedir> (at least mostly)
* dbus/dbus-sysdeps.c (_dbus_change_identity): set the group ID
first, then the user ID
* bus/config-parser.c: hacking
* dbus/dbus-memory.c: don't use DBusList for the list of stuff
to shut down, since it could cause weirdness with the DBusList
lock
* dbus/dbus-list.c (_dbus_list_test): add tests for the
link-oriented stack routines
(alloc_link): free the mempool if the first alloc from it fails
* dbus/dbus-mempool.c (struct DBusMemBlock): fix alignment issue
* dbus/dbus-string.c (UNICODE_VALID): sync new version of this
from GLib
(_dbus_string_skip_white): new
* doc/config-file.txt (Elements): add <includedir>
* bus/test-main.c, dbus/dbus-test.c (main): check memleaks
after every test so it's quick and easy to see which leaked, and
so we test multiple dbus_shutdown() calls
* configure.in: change configure.in XML stuff to also support
expat
* config-loader-libxml.c: some hacking
* config-loader-expat.c: some hacking
* config-parser.c: some hacking, plus tests
