VAGrENT: v2.1.0 - Small feature update and some annotation improvements

Added a new option for AnnotateVcf.pl to zip and tabix index its results file. Also improved the handling of some rarer transcript structures involving start and stop codons. Namely where the first base of a start codon was also the first base of an exon, or where the last base of a stop codon was the last base of an exon. Variants located close to start/stop codons in these structures should be handled more consistently now