added a snippet to properly read the input files for sample_correlation
added a snippet to properly read the input files for sample_correlation

SciLifeLab/NGI-RNAseq,ewels/NGI-MethylSeq,Hammarn/NGI-RNAseq,ewels/NGI-MethylSeq,ewels/NGI-RNAseq,Galithil/NGI-RNAseq,Galithil/NGI-RNAseq,SciLifeLab/NGI-RNAseq,SciLifeLab/NGI-RNAseq,Hammarn/NGI-RNAseq,SciLifeLab/NGI-RNAseq,ewels/NGI-RNAseq,Galithil/NGI-RNAseq,Hammarn/NGI-RNAseq,Hammarn/NGI-RNAseq,Hammarn/NGI-RNAseq,ewels/NGI-RNAseq,ewels/NGI-RNAseq,SciLifeLab/NGI-RNAseq,ewels/NGI-MethylSeq,Galithil/NGI-RNAseq,ewels/NGI-RNAseq