This function creates a SAF file from a features path file for the given blocks and features
saf_from_paths(
pathsFile,
groupBy = c("mRNA", "gene"),
block = c("exon", "CDS")
)
SAF formatted data frame for the given blocks and features
Path to the input features path file
Vector of features to group by in feature count
Vector of features to be used as block in feature count