run_atac: Run ATAC-seq analysis
In anilchalisey/chompR: ChIP and ATAC-seq data processing pipeline

Complete pipeline from quality assessment of raw reads through to peak calling and differential analysis.

run_atac(sample.info, reference = NULL, species = c("human", "mouse"),
  output.dir, threads = NULL, bigwig = FALSE, fastqc = "fastqc",
  multiqc = "multiqc", fastp = "fastp", samtools = "samtools",
  hisat2 = "hisat2", sambamba = "sambamba", idx = NULL,
  macs2 = "macs2", featurecounts = "featureCounts", broad = FALSE)

`sample.info`	character string giving the path to a tab-delimited text file with at least the columns <condition> (treatment condition), <sample> (sample name), and <file1> (absolute or relative path to the fastq files). If fastq files and PE reads, then a column <file2> should also be present. If a batch effect is to be included in the design, then this should be identified under the column <batch>.
`reference`	character vector specifying the conditions in order. For example, c("A", "B", "C", "D") would mean "A" is the reference condition to which "B", "C" and "D" are compared; in addition, "C" and "D" will be compared to "B", and "D" will be compared to "C". If `NULL` then the comparisons will be arranged alphabetically. [DEFAULT = NULL].
`species`	character string specifying the name of the species. Only `'human'`, and `'mouse'` are supported at present. [DEFAULT = human].
`output.dir`	character string specifying the directory to which results will be saved. If the directory does not exist, it will be created.
`threads`	an integer value indicating the number of parallel threads to be used by FastQC. [DEFAULT = maximum number of available threads - 1].
`bigwig`	logical, if `TRUE` then bigwif files will be created.
`fastqc`	a character string specifying the path to the fastqc executable. [DEFAULT = "fastqc"].
`multiqc`	a character string specifying the path to the multiqc executable. [DEFAULT = "multiqc"].
`fastp`	a character string specifying the path to the fastp executable. [DEFAULT = "fastp"].
`samtools`	a character string specifying the path to the samtools executable. [DEFAULT = "samtools"].
`hisat2`	a character string specifying the path to the hisat2 executable. [DEFAULT = "hisat2"].
`sambamba`	a character string specifying the path to the sambamba executable. [DEFAULT = "sambamba"].
`idx`	character vector specifying the basename of the index for the reference genome. The basename is the name of any of the index files up to but not including the final .1.ht2, etc. If `NULL` then the index for the relevant species (human or mouse) will be created using the `build_index()` function.
`macs2`	a character string specifying the path to the MACS2 executable. [DEFAULT = "macs2"].
`featurecounts`	a character string specifying the path to the featurecounts executable. [DEFAULT = "featureCounts"].
`broad`	logical, if `TRUE` then broad peaks will be called.