Don't force boot-disk-only install, for reasons unknown it causes more

problems than it solves. In stead, put a warning near the top of the
welcome message. Fixes (or, rather works around) bug #764975.

Mac/OSX/Dist/build

@@ -7,7 +7,7 @@
 # Script configs
 PYVERSION=2.3rc1plus
 PYVER=2.3
-BUILDNUM=6
+BUILDNUM=8
 DOCLEANUP=no
 
 PROGDIR="`dirname \"$0\"`"
@@ -126,10 +126,10 @@ python $PYTHONSRC/Mac/scripts/buildpkg.py \
     --Relocatable="NO" \
     --InstallOnly="YES" \
     --UseUserMask="NO" \
-    --RootVolumeOnly="YES" \
     $INSTALLROOT \
     $RESOURCEDIR
 
+#    --RootVolumeOnly="YES" \
 
 # ...and then make a disk image containing the package.
 mv MacPython-OSX.pkg $DMGDIR/root

Mac/OSX/Dist/resources/Welcome.txt

-This package will install MacPython 2.3rc1+ for Mac OS X 10.2. 
-Installation on 10.0, 10.1 or the Panther seed is explicitly discouraged.
+This package will install MacPython 2.3rc1+ for Mac OS X 10.2. Installation
+on the Panther preview may work, on 10.1 or earlier will not work.
+
 Installation requires approximately 20 MB of disk space, ignore the
-message that it will take zero bytes.
+message that it will take zero bytes. You must install onto your current
+boot disk, even though the installer does not enforce this, otherwise
+things will not work.
 
 MacPython consists of the Python programming language interpreter, 
 plus a set of programs to allow easy access to it for Mac users (an