Add special::Bessel trait with xsf implementation#73
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Introduces the xsf namespace without tainting the special:: namespace. Introduces the chbevl function, which will be needed for functions such as i0, i1, k0, k1, rgamma and shichi.
Implement bessel as a trait for f64 with the modified i0 bessel function first. Can easily be extended for Vec and Array as necessary later.
We keep the extra precision to keep it easy to maintain the implementations (currently just mirrored) between the f32 and f64 versions.
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Add xsf namespace (without polluting special namespace) as being a strictly internal set of functions.
Add Bessel trait.
Add modified bessel i0 function. Here are the plots.
Add scaled modified bessel i0e function.
Similar issue to #71 where clippy complains that there is an excess of precision. This is probably however necessary to ease maintainence burden.
Supercedes #71.