[PROJ] Plate motion models

[Even Rouault]

Correcting typo (+ellps+GRS80 ==> +ellps=GRS80), but that doesn't change 
results as this is the default ellipsoid
>
> echo -100 40 0 2022.1 | cct -d 8 +proj=pipeline \
>     +step +proj=cart +ellps=GRS80 \
>     +step +inv +init=ITRF2014:ITRF2000 \
>     +step +inv +init=ITRF2014:NOAM +t_epoch=2010 \
>     +step +proj=set +v_4=2010 \
>     +step +init=ITRF2014:ITRF2000 \
>     +step +inv +proj=cart +ellps=GRS80
>
>
-- 
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