Selecting samples by vector of strings preserves order of original profile

[kescobo]

eg

julia> comm = CommunityProfile(rand(10, 4), Taxon.(["t$i" for i in 1:10]), MicrobiomeSample.(["s$i" for i in 1:4]))
CommunityProfile{Float64, Taxon, MicrobiomeSample} with 10 features in 4 samples

Feature names:
t1, t2, t3...t9, t10

Sample names:
s1, s2, s3, s4



julia> comm[:, ["s4", "s1"]]
CommunityProfile{Float64, Taxon, MicrobiomeSample} with 10 features in 2 samples

Feature names:
t1, t2, t3...t9, t10

Sample names:
s1, s4