[Proj] Coming releases of PROJ.4

[Even Rouault]

> The problem is that pj_inv() hard fails when an inverse is attempted and
> none exists, so we need protection to avoid crashing the R session:

For the record, this issue has been fixed in proj 4.9.3 per :
https://github.com/OSGeo/proj.4/commit/757a2c8f946faccf9d094d76cb79e6ebe0006564#diff-f0c3df1eafd91a86f6cd9cf68cc306ddR23

pj_inv will now return (HUGE_VAL,HUGE_VAL) if the inverse doesn't exist.

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