Addition of stdlib_experimental_stats function mean#119

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jvdp1 wants to merge 4 commits intofortran-lang:masterfrom

jvdp1:stat_mean_dev

Commits on Jan 21, 2020

addition of stdlib_experimental_stats function mean
jvdp1
committed

Commits on Jan 22, 2020

stat_mean_dev: update of the spec following comments
jvdp1
committed

Commits on Jan 23, 2020