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DOC: add section on setting random number seeds

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`@@ -139,6 +139,23 @@ execution (such as created figures or modified rc params). The pytest fixture`
`139`	`139`	:func:`~matplotlib.testing.conftest.mpl_test_settings` will automatically clean
`140`	`140`	`these up; there is no need to do anything further.`
`141`	`141`
	`142`	`+Random data in tests`
	`143`	`+--------------------`
	`144`	`+`
	`145`	`+Random data can is a very convenient way to generate data for examples,`
	`146`	`+however the randomness is problematic for testing (as the tests`
	`147`	`+must be deterministic!). To work around this set the seed in each test.`
	`148`	`+For numpy use::`
	`149`	`+`
	`150`	`+ import numpy as np`
	`151`	`+ np.random.seed(19680801)`
	`152`	`+`
	`153`	`+and Python's random number generator::`
	`154`	`+`
	`155`	`+ import random`
	`156`	`+ random.seed(19680801)`
	`157`	`+`
	`158`	`+The seed is John Hunter's birthday.`
`142`	`159`
`143`	`160`	`Writing an image comparison test`
`144`	`161`	`--------------------------------`

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