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* Add get_random_beta

* simplify beta distribution generation

* add tests

* fix condition and use full names for shape parameters

* remove unneeded include

* match test types to prevent Windows from failing tests

* Revert "remove unneeded include"

This reverts commit 35f55a96e91f4c4340a0bda344c494f1ce68d521.

* Revert "match test types to prevent Windows from failing tests"

This reverts commit a990307066e99cb56e15ae5de63e67e29cc72911.

* Revert "Revert "remove unneeded include""

This reverts commit 59be002c9e8b8a6ac395d87e6bf9d4b57af19d28.

* fix outdated message in DLIB_CASSERT

* relax mpc condition again

* Revert "relax mpc condition again"

This reverts commit 1d208c5dcf1ddc15e09e68e1e2e11145506729ae.

* Loop while both alpha and beta are zero

* Update dlib/rand/rand_kernel_abstract.h
Co-authored-by: Davis E. King <davis685@gmail.com>