ClinVar VCF 2.0 support

[visze]

see here: ftp://ftp.ncbi.nlm.nih.gov/pub/clinvar/vcf_GRCh37/vcf_2.0/

[visze]

ClinVar VCF 2.0 has errors in it so that it is not possible to parse it with HTSJDK

E.g. ref/alt is the same

1       25717365        17708   C       C       .       .       ALLELEID=32747;CLNDISDB=.;CLNDN=RH_E/e_POLYMORPHISM;CLNHGVS=NC_000001.10:g.25717365C=;CLNREVSTAT=no_assertion_criteria_provided;CLNSIG=Benign;CLNVC=single_nucleotide_variant;CLNVCSO=SO:0001483;CLNVI=OMIM_Allelic_Variant:111700.0001;GENEINFO=RHCE:6006;MC=SO:0001627|intron_variant,SO:0001819|synonymous_variant;ORIGIN=1;RS=609320