[vwnc] VM+Image compatibility

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[vwnc] VM+Image compatibility

Jan Weerts
Hi all,

this is a feature request of sorts, because the subject bit me more
than once.

If you start a vm with an incompaible newer image there are three
options:
- you are lucky, the image starts and runs fine
- you feel lucky, the image seems to run stable but dies sooner
  or later
- the system segfaults on the invocation

I wonder how difficult it would be to:
- let the vm check the image marker bytes and deny to start, if
  the image version is not supported by this vm, possible forced
  still to start by some -force option.
  This is some functionality similar to the one already available
  in the VisualWorks.exe binary on Windows
- let the vm check, that the shared object library vwntoe.dll does
  not pair well with the vwnt.exe

I guess it is save to assume, that older VMs never work well with
newer images, so that should be quite simple to achieve.

Regards
  Jan

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