parallel_peak_calling: Run peak callings in parallel on bash sever
In ZW-xjtlu/exomePeak2Test: Easy test of the exomePeak2 performance.

Run peak callings in parallel on bash sever

parallel_peak_calling(
  coldata,
  bam_dir = "./",
  save_dir = "./",
  autocreate = T,
  parallel_num = 9,
  pc_function = exomePeak2_hg19,
  front_name = "pkc_",
  single_base = F,
  GC_correct = T,
  correct_GC_bg = F,
  background = "Gaussian_mixture",
  qtnorm = T
)

`coldata`	a `data.frame` which it columns containing the design information.
`bam_dir`	the directory containing the bam files.
`save_dir`	the directory to save the resulting RDS files of the