This function takes an array of ENSEMBL ID and convert it into GENE SYMBOL.
get_GeneEnsembl2Symbol(ensemble.arr, dataset = "mmusculus_gene_ensembl")
a character array. The ENSEMBL ID array.
must be either "mmusculus_gene_ensembl" or "hsapiens_gene_ensembl".
A data frame contains 3 columns, "Gene", "Symbol" and "description".