Updated tfsites_expression for new fields
Updated tfsites_expression for new fields

tfsites_expression now correctly parses MOTIFVH, MOTIFRH, MOTIFVG, MOTIFRG
tfistes_expression now will try to read the sample name (by splitting on '.') from the -i argument
tfsites_expression can be told the sample name via -sn argument (will override filename)
j-andrews7/VAMPIRE,j-andrews7/VENUSAR