Revert "Move Statistics to an extension (#566)" (#567)

This reverts commit d83b427.

Author: jishnub

Project.toml

@@ -20,16 +20,15 @@ LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
 LowRankMatrices = "e65ccdef-c354-471a-8090-89bec1c20ec3"
 SparseArrays = "2f01184e-e22b-5df5-ae63-d93ebab69eaf"
 StaticArrays = "90137ffa-7385-5640-81b9-e52037218182"
+Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 
 [weakdeps]
 DualNumbers = "fa6b7ba4-c1ee-5f82-b5fc-ecf0adba8f74"
 SpecialFunctions = "276daf66-3868-5448-9aa4-cd146d93841b"
-Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 
 [extensions]
 ApproxFunBaseDualNumbersExt = "DualNumbers"
 ApproxFunBaseSpecialFunctionsExt = "SpecialFunctions"
-ApproxFunBaseStatisticsExt = "Statistics"
 
 [compat]
 AbstractFFTs = "0.5, 1"
@@ -59,8 +58,7 @@ DualNumbers = "fa6b7ba4-c1ee-5f82-b5fc-ecf0adba8f74"
 Infinities = "e1ba4f0e-776d-440f-acd9-e1d2e9742647"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 SpecialFunctions = "276daf66-3868-5448-9aa4-cd146d93841b"
-Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [targets]
-test = ["Aqua", "Random", "Infinities", "Test", "SpecialFunctions", "DualNumbers", "Statistics"]
+test = ["Aqua", "Random", "Infinities", "Test", "SpecialFunctions", "DualNumbers"]

ext/ApproxFunBaseStatisticsExt.jl

@@ -16,6 +16,7 @@ using LinearAlgebra
 using LowRankMatrices
 using SparseArrays
 using StaticArrays: SVector, @SArray, SArray
+import Statistics: mean
 
 import DomainSets: Domain, indomain, UnionDomain, ProductDomain, Point, ∂,
               SetdiffDomain, Interval, ChebyshevInterval, boundary,

src/ApproxFunBase.jl

@@ -12,7 +12,6 @@ using Infinities
 using LinearAlgebra
 using Random
 using SpecialFunctions
-using Statistics
 using Test
 
 @testset "Project quality" begin
@@ -793,8 +792,3 @@ end
 
     @test @inferred(chebyshev_clenshaw(BigInt[1], 1)) == 1
 end
-
-@testset "Statistics" begin
-    @test mean(Segment(1,3)) == 2
-    @test mean(1..3) == 2
-end