mix_grp_tbl: Title
In csiro-crop-informatics/granular: Resolving starch granule distributions

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mix_grp_tbl(.data, proportion, size, mu_vec, pi_vec = NULL,
  sigma_vec = NULL, peak_names = NULL, emnum = 10, log_trans = TRUE,
  parallel = FALSE)

`.data`	A tbl grouped by each distribution
`proportion`	An unquoted variable name
`size`	An unquoted variable name
`mu_vec`	A vector defining distribution means (required)
`pi_vec`	A vector defining distribution proportions (optional)
`sigma_vec`	A vector defining distribution dispersion (optional)
`peak_names`	A vector defining peak names (optional)
`emnum`	passed to mix() - A non-negative integer specifying the number of EM steps to be performed
`log_trans`	Logical. Should values be log-transformed?
`parallel`	Logical. Should multidplyr be used to run in parallel? (EXPERIMENTAL)