Edit QC pipeline of QTL

[swvanderlaan]

Several items need improvement or fixing:

• to check the delimiter automatically of the annotation file
• add in the data.table() to read and write tables using fread or fwrite
• the eQTL-part (nom/perm for cis) to match with the new 'strand' column (as the column numbers have changed by the addition of the 'strand' column in the output)
• double check the trans-QTL-part to match with the new 'strand' column (as the column numbers have changed by the addition of the 'strand' column in the output)
• double check the mQTL-part to match with the new 'strand' column (as the column numbers have changed by the addition of the 'strand' column in the output)