Update the image directory's README to mention the 64-bit scripts and drop mention of the obsolete scripts, plus a hand hold if the VM doqwnload doesn't work.
Update the image directory's README to mention the 64-bit scripts and drop
mention of the obsolete scripts, plus a hand hold if the VM doqwnload doesn't
work.

timfel/squeakvm,OpenSmalltalk/vm,timfel/squeakvm,timfel/squeakvm,OpenSmalltalk/vm,timfel/squeakvm,OpenSmalltalk/vm,timfel/squeakvm,timfel/squeakvm,timfel/squeakvm,OpenSmalltalk/vm,OpenSmalltalk/vm,timfel/squeakvm,OpenSmalltalk/vm,OpenSmalltalk/vm,OpenSmalltalk/vm