Debuged division by zero when no reads found in coverage and some typos
Debuged division by zero when no reads found in coverage and some typos

chamaelj/tools-artbio,ARTbio/tools-artbio,chamaelj/tools-artbio,drosofff/tools-artbio,drosofff/tools-artbio,chamaelj/tools-artbio,ARTbio/tools-artbio,drosofff/tools-artbio,drosofff/tools-artbio,ARTbio/tools-artbio,ARTbio/tools-artbio