Corrected typos and added dependency to rtracklayer in PICSs R scripts

Signed-off-by: Charles Joly Beauparlant <Charles.Joly-Beauparlant@crchul.ulaval.ca>
Added a new folder named peaks-bed that will contains symbolic links to every bed files generated during the analysis

Signed-off-by: Charles Joly Beauparlant <Charles.Joly-Beauparlant@crchul.ulaval.ca>
Added the possibility to add options when using init with macs14 or macs2

Signed-off-by: Charles Joly Beauparlant <Charles.Joly-Beauparlant@crchul.ulaval.ca>