nf_modules: masc2 add DSL2

src/nf_modules/macs2/main.nf

+version = "2.1.2"
+container_url = "lbmc/macs2:${version}"
+
+process peak_calling {
+  container = "${container_url}"
+  label "big_mem_multi_cpus"
+  tag "${file_id}"
+  publishDir "results/peak_calling/${file_id}", mode: 'copy'
+
+  input:
+    tuple val(file_id), path(bam_ip), path(bam_control)
+
+  output:
+    path "*", emit: peak
+    path "*_report.txt", emit: report
+
+  script:
+/* remove --nomodel option for real dataset */
+"""
+macs2 callpeak \
+  --treatment ${file_ip} \
+  --call-summits "True"\
+  --control ${file_control} \
+  --keep-dup "auto" \
+  --name ${file_id} \
+  --gsize ${params.genome_size} 2> \
+  ${file_ip}_macs2_report.txt
+
+if grep -q "ERROR" ${file_ip}_macs2_report.txt; then
+  echo "MACS2 error"
+  exit 1
+fi
+"""
+}
+