[jerome-white]

Closes #39. Part of #38.

What this does

B is renamed trials (formerly B; Carterette and Sakai write it as B), everywhere:

• Library: randomized_tukey_hsd(...; trials, systems). The error is now trials must be positive, got .... Internally the variable is trials too; the local that held "the number of trials at least as large as the difference" is renamed exceeding so the two do not clash. Docstring updated.
• CLI: --trials N, -n N and --B N are the same option (dest_name = "trials"); --help shows -n, --trials, --B TRIALS; the missing-option error now reads required option --trials was not provided. The settings message prints trials (it used to print B).
• Tests, benchmarks and the README use the new name. benchmark/randomized_tukey.jl prints a trials column header. The tables already recorded in benchmark/README.md keep their B header, with a note at the top saying B there is trials.

Decisions

• No deprecation of the library keyword. The version is 0.1.0-DEV and nothing depends on it, so B= simply no longer exists (calling with it is a MethodError for the missing trials).
• The CLI alias is silent. --B works without a warning. Say if you want it to warn, and when it should go.
• No NEWS.md started here. The README line for trials says it was called B before ("called B in the literature and in earlier versions of this package") and the benchmark README notes the old header. A NEWS.md is the question left open on Rename B to trials (library keyword and CLI option) #39 and Neutral vocabulary: blocks and treatments in docs and output #42.
• Not renamed: the B in test/reference/ text that describes Sakai's tool (his recommendation of B between 1000 and 5000) and B as a system name in the fixtures.

Verification

• ] test: 111 pass + 1 deliberately broken at 1 and 4 threads.
• benchmark/snapshot.jl output is byte-identical to before the rename.
• CLI: --trials 500, -n 500 and --B 500 give identical output with --seed 1, identical to the old --B 500 --seed 1 output; omitting it gives the error above.
• 80 columns checked.

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