This function ftps to the supplied gtf url, downloads gtf to current directory and assembles annotation details into a SCANVISreadable object
a gencode object compatible (and required) for use with most SCANVISfunctions
Web access required. If variants are available and intended for use with SCANVISlinkvar, the gencode reference genome must be the same as that used for the variant calls.
## Not run: gen19=SCANVISannotation('ftp://ftp.ebi.ac.uk/pub/databases/gencode/Gencode_human/release_19/')
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