[Math] Remove "NullArgumentException"

[Gilles Sadowski <gi...@gmail.com>]

Hello.

Consistently with recent discussion (e.g. new implementation of
"genetic algorithms"), we've informally agreed to stick with the
standard exceptions (defined by the JDK).
Case in point: "NullArgumentException"[1] should be removed from
the code base, in favour of "NullPointerException".[2]

Regards,
Gilles

[1] https://gitbox.apache.org/repos/asf?p=commons-math.git;a=blob;f=commons-math-legacy-exception/src/main/java/org/apache/commons/math4/legacy/exception/NullArgumentException.java;h=ec371bb20a7acc41692789029c9bfa424cf14fb9;hb=HEAD
[2] https://docs.oracle.com/javase/8/docs/api/java/lang/NullPointerException.html

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