In working to port Jérôme's new cylinder and cone uv_mapping to the 
3.7.1 master branch, I found the mapping to be upside-down (V flipped) 
to what I expected.

I decided to look at all(1) the uv_mapping, map_type image mapping and 
warp based mapping to see where things stood. I found the torus 
uv_mapping flipped left-right (U flipped) and the just added lemon also 
flipped in V but everything else having a consistent orientation. See 
the attached figure.

A github pull request #131 has been submitted for Jérôme's cone and 
cylinder uv_mapping except flipped to the usual V orientation and as 
shown in the figure.

I'll work on updates & pull requests to align the lemon (B) and torus 
(A) uv_mapping, but I'll wait a day or two should there be other opinions.

Bill P.
(1) - Except the box/cubic mapping.

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