update: Change autobenchR settings during a run.
In bjmt/autobenchR: Automated code benchmarking

Changes the benchmark settings partway through an autobenchR session.

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update(max.reps = NULL, min.time = NULL, unit = NULL, check = NULL,
  min.reps = NULL, tool = NULL, stop.on.fail = NULL,
  permanent = FALSE)

`max.reps`	If `tool = "bench"`, the maximum number of times to run each expression. If `tool = "microbenchmark"` or `tool = "rbenchmark"`, the exact number of times to run each expression.
`min.time`	Only applies if `tool = "bench"`. Minimum time in seconds to each expression (unless expression has already been run `max.reps` times).
`unit`	Only applies if `tool = "microbenchmark"` or `tool = "rbenchmark"`. Units to show in benchmarking results tables. See `microbenchmark::microbenchmark()` for acceptable units when `tool = "microbenchmark"`. When `tool = "rbenchmark"`, acceptable units are "ns" (nanoseconds), "us" (microseconds), "ms" (milliseconds), "s" (seconds), and "min" (minutes). The default, `unit = "t"`, when run with `tool = "microbenchmark"` will automatically pick a unit; and when run with tool = "rbenchmark", seconds are used.
`check`	Make sure all expressions in a run return equal values. Only valid if `tool = "bench"` or `tool = "microbenchmark"`.
`min.reps`	Only applies if `tool = "bench"`. Minimum number of times to run each expression.
`tool`	Benchmarking package used by autobenchR. One of "bench", "microbenchmark", and "rbenchmark".
`stop.on.fail`	Whether to give an error if one of the expressions gives an error, or continue.
`permanent`	Whether to only change the settings of the next immediate set of benchmarks, or all following benchmarks. Note that only one set of updated settings are stored, so calling `autobenchR::update()` again will overwrite these.