Return the arc tangent of a given number.

number:atan(FLOAT $number) : FLOAT

number:atan(0.50)
#=> 0.4636476090008061

number:atan(-0.50)
#=> -0.4636476090008061

number:atan(5)
#=> 1.373400766945016

number:atan(-5)
#=> -1.373400766945016

number:atan(100)
#=> 1.5607966601082315

number:atan(-100)
#=> -1.5607966601082315

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