Added test foir i/o

test/io/test_io.jl

+###
+### "THE BEER-WARE LICENSE":
+### Alberto Ramos wrote this file. As long as you retain this 
+### notice you can do whatever you want with this stuff. If we meet some 
+### day, and you think this stuff is worth it, you can buy me a beer in 
+### return. <alberto.ramos@cern.ch>
+###
+### file:    test_io.jl
+### created: Thu Jun  2 18:20:42 2022
+###                               
+
+using LatticeGPU, Test
+
+T = Float64
+lp = SpaceParm{4}((16,16,16,16), (4,4,4,4), BC_PERIODIC, (0,0,0,0,0,0))
+gp = GaugeParm{T}(SU3{T}, 6.1, 1.0)
+ymws = YMworkspace(SU3, T, lp)
+
+randomize!(ymws.mom, lp, ymws)
+U = exp.(ymws.mom)
+
+pl1 = plaquette(U, lp, gp, ymws)
+cl1 = Eoft_clover(U, gp, lp, ymws)
+fn = "foo.bdio"
+rm(fn, force=true)
+save_cnfg(fn, U, lp, gp; run="Dumnmy_run")
+
+Ucp = read_cnfg(fn)
+pl2 = plaquette(Ucp, lp, gp, ymws)
+cl2 = Eoft_clover(Ucp, gp, lp, ymws)
+rm(fn, force=true)
+
+@testset "Testing configuration i/o" begin
+    @test isapprox(pl1,pl2)
+    @test isapprox(cl1,cl2)
+end
+