De-duplicate test value column names

[EeethB]

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Changes Description

Closes #75

When running a closed test with parametric testing, the detailed test values data frame has two columns named *. This PR de-duplicates those names by changing them to *_a and *_b. The print function still prints them without the suffixes though

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[xidongdxi]

Many thanks. For parametric tests, there are now two columns: *_a and *_b to separate two * operations. It works.

For bonferroni and simes, it seems that only *_b is used. I think for only bonferroni, only simes, and bonferroni+simes, there is no need to distinguish two columns. It is fine to just have one column *.

hypotheses <- c(0.5, 0.5, 0, 0)
transitions <- rbind(
    c(0, 0.5, 0.5, 0),
    c(0.5, 0, 0, 0.5),
    c(0, 1, 0, 0),
    c(1, 0, 0, 0)
)
hyp_names <- c("H1", "H2", "H3", "H4")
g <- graph_create(hypotheses, transitions, hyp_names)
p_values <- c(.018, .01, .105, .006)
# Bonferroni
test_results_test_values <- graph_test_shortcut(
    g,
    p = p_values,
    alpha = 0.025,
    test_values = TRUE
)
head(test_results_test_values$test_values$results)

# Simes
test_results_simes <-
    graph_test_closure(
        g,
        p = p_values, alpha = 0.025,
        test_groups = list(c(1, 2), c(3, 4)),
        test_types = c("simes", "simes"),
        test_values = TRUE
    )

head(test_results_simes$test_values$results)