apache / commons-numbers / 489

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NUMBERS-143: Added specialised hypot function to Complex.

The new implementation is faster and has lower maximum error than using
Math.hypot.

This is a port of the "Freely Distributable Math Library" hypot
function. The original source notice is included in the project LICENSE.

The functionality of Complex.abs should match Math.hypot for infinity
edge case handling and scaling of the intermediate sum. Tests have
been added to the CStandardTest to check the returned value on random
numbers.

Update Complex performance test for Complex.abs().
Add tests for Math.sqrt(Complex.norm()) and use of Math.hypot().
Increase size to 10000 to prevent branch prediction memorising the test
data.

Exclude PMD rule ExcessiveMethodLength for Complex.

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