default session is selected. This is because we always want to run
our own initialisation (like starting ssh-agent).
* ssh-agent: don't start it is a child but have it re-exec the
xsession script. This ensures that ssh-agent quits when we log out.
* In the xsession script, don't redirect output to ~/.xsession-errors
if the display manager is kdm, since kdm already does that. In fact
it uses ~/.xsession-errors<optional number> if there are concurrent
X sessions.
* For consistency with other distros and the xdm manpage, exec the
~/.xsession script instead of sourcing it. Do this for the "custom"
session type provided by kdm.
svn path=/nixos/trunk/; revision=17087
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