VRIMG Skip existing buckets

[olly]

I think it would be nice if we had an option for vray to check if a VRIMG file exists and if it does to skip the existing buckets that have already been rendered.

Could be a real life saver when a Backburner job restarts because the maximum render time is exceeded or is paused to make way for a more important job...

What do you think?

Cheers,
Olly