plink_dedup: Remove duplicated variants
In imbs-hl/imbs: Collection of functions used at the IMBS

Uses cut, sort, uniq and awk to find duplicated markers excludes them using PLINK.

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plink_dedup(bfile, output.prefix, ..., bed.file = NULL,
  bim.file = NULL, fam.file = NULL, exec = "plink2", num.threads,
  memory)

`bfile`	[`string`] The basename of the binary PLINK files.
`output.prefix`	[`string`] The basename of the new binary PLINK files.
`...`	[`character`] Additional arguments passed to PLINK.
`bed.file`	[`string`] Alternative to `bfile` interface. Specify `bed`, `bim` and `fam` files individually.
`bim.file`	[`string`] Alternative to `bfile` interface. Specify `bed`, `bim` and `fam` files individually.
`fam.file`	[`string`] Alternative to `bfile` interface. Specify `bed`, `bim` and `fam` files individually.
`exec`	[`string`] Path of PLINK executable.
`num.threads`	[`int`] Number of CPUs usable by PLINK. Default is determined by SLURM environment variables and at least 1.
`memory`	[`int`] Memory for PLINK in Mb. Default is determined by minimum of SLURM environment variables `SLURM_MEM_PER_NODE` and `num.threads * SLURM_MEM_PER_CPU` and at least 5000.