This should fix some problems in the vicinity of ±π longitude.

The problems were encountered in direct localization. Some line-of-sight
was almost parallel to a latitude boundary, at 1.0e-14 level. This
triggered an exception in the Duvenhage algorithm.

Thanks to Silvia Ríos Bergantiños and Beatriz Salazar for the
translations.
        

This is done by dumping its state into a file, thus avoiding costly
initialization.