Deal in solid angle fractions, not absolute solid angles.

* src/extent-sampling.sc (volume-cone): Use
solid-angle-fraction->planar-angle instead of
solid-angle->planar-angle.
* src/nd-random.sc (planar-angle->solid-angle): Rename to
planar-angle->solid-angle-fraction and return a solid angle fraction.
(solid-angle->planar-angle): Rename to
solid-angle-fraction->planar-angle and accept a solid angle fraction.
(hollow-cone-random-vector): Use planar-angle->solid-angle-fraction
instead of planar-angle->solid-angle.
(beta-inc-unnormalized, incomplete-wallis-integral): Delete functions.
* include/nd-random.h (planar_angle_to_solid_angle): Rename to
planar_angle_to_solid_angle_fraction.
(solid_angle_to_planar_angle): Rename to
solid_angle_fraction_to_planar_angle.
* scm/nsmc/wrap.scm (planar-angle->solid-angle): Rename to
planar-angle->solid-angle-fraction.

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