Not clobbering non-XFree86 servers on xbase upgrade.
Would it be too difficult to set up xbase so that it doesn't always
clobber non Debianized X servers on upgrade. I have to edit
/etc/X11/xdm/Xservers and reinstall Accelerated X so that
/usr/bin/X11/X isn't XF86_NONE after every upgrade.
Perhaps something like the new sendmail setup would be appropriate.
It has a final section in /etc/mail/sendmail.mc which is preserved.
It starts like this:
## Custom configurations below (will be preserved)