change gff for gtf

See merge request !3

fix bug (index bam between star and htseq)

See merge request !2

add star + htseq + multiqc

See merge request !1

correction of the script : addition of include  {bam_to_fastq_singleend } from './nf_modules/bedtools/main.nf'

samtools/main.nf le process filter_bam_mapped avec en params.filter_bam_mapped = "-f 4"
bedtools/main.nf le process bam_to_fastq_singleend
fastqc/main.nf le process fastqc_fastq