- new function platform_get_x_display() to find a sensible local display.
On Unix, the Gtk apps weren't taking account of --display when
determining where to send forwarded X traffic.
- explicitly document that leaving X display location blank in config tries
to do something sensible (and that it's now blank by default)
- don't override X11Display setting in plink, since that's more properly
done later
git-svn-id: svn://svn.tartarus.org/sgt/putty@4604
cda61777-01e9-0310-a592-
d414129be87e