filtering out N-UMIs

escape awk $

(1) bugfix: removed extra space in .bed.gz files, found in addition to the intended tab spacers; (2) replaced "FS" with "," in awk for readability

(1) removed "+" symbols from output file names; (2) fix to avoid scientific notation in coordinates; (3) removed headers from output files; (4) minor readability changes

fix: script won't crash if output folder already exists

removed some newlines in some short blocks

input colnames are now assigned within this code, rather than by previous steps of the pipeline (hence they won't be required as headers in ".bed.gz" files)

process EXTRACT: barcode length is now automatically inferred from input samplesheet, allowing different lengths (if present)

adjusting some descriptions (p1)