X forwarding changes:

X forwarding changes:
 - 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