[PATCH] VCL temperature improvements

[Dridi Boukelmoune]

> Same patches as last time, rebased against current master. I sneaked
> in a trivial patch (0001) taking advantage of the review.

Hi,

As requested I pushed the patches 1 to 4 from the previous batch. The
patch 2 was slightly amended to have peuso-enum symbols in upper case,
I have pushed another similar change (see ad8d91f). The patch 4 was also
amended to introduce two functions with distinct signatures instead of
a single catch-all.

Please find attached the remaining patches for the next review. The
patches that have been accepted so far are only the prep work, actual
fixes ahead!

Cheers,
Dridi
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