Convert the geometric input functions to report errors softly.

Convert box_in, circle_in, line_in, lseg_in, path_in, point_in,
and poly_in to the new style.

line_in still throws hard errors for overflows/underflows that can occur
when the input is specified as two points rather than in the canonical
"Ax + By + C = 0" style.  I'm not too concerned about that: it won't be
reached in normal dump/restore cases, and it's fairly debatable that
such conversion should ever have been made part of a type input function
in the first place.  But in any case, I don't want to extend the soft
error conventions into float.h without more discussion than this patch
has had.

Amul Sul, minor mods by me

Discussion: https://postgr.es/m/CAAJ_b97KeDWUdpTKGOaFYPv0OicjOu6EW+QYWj-Ywrgj_aEy1g@mail.gmail.com

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