convert --gvcf2vcf adds one to end of block

[mwonge]

Current --gvcf2vcf adds an extra position to the end of block.

Example below: End block is position 12782 but after conversion, end block is 12783 which then clashes with the real 12783 and you get duplicated locations.

gVCF (truncated to end block) :
chr1 12768 . C . . PASS END=12782;BLOCKAVG_min30p3a
chr1 12783 . G T 63 PASS SNVSB=0;SNVHPOL=2
chr1 12784 . T . . PASS END=12800;BLOCKAVG_min30p3a

After conversion:
chr1 12768 . C . . PASS BLOCKAVG_min30p3a GT:GQX:DP:DPF 0/0:33:12:1
chr1 12769 . C . . PASS BLOCKAVG_min30p3a GT:GQX:DP:DPF 0/0:33:12:1
chr1 12770 . C . . PASS BLOCKAVG_min30p3a GT:GQX:DP:DPF 0/0:33:12:1
chr1 12771 . C . . PASS BLOCKAVG_min30p3a GT:GQX:DP:DPF 0/0:33:12:1
chr1 12772 . C . . PASS BLOCKAVG_min30p3a GT:GQX:DP:DPF 0/0:33:12:1
chr1 12773 . C . . PASS BLOCKAVG_min30p3a GT:GQX:DP:DPF 0/0:33:12:1
chr1 12774 . C . . PASS BLOCKAVG_min30p3a GT:GQX:DP:DPF 0/0:33:12:1
chr1 12775 . C . . PASS BLOCKAVG_min30p3a GT:GQX:DP:DPF 0/0:33:12:1
chr1 12776 . C . . PASS BLOCKAVG_min30p3a GT:GQX:DP:DPF 0/0:33:12:1
chr1 12777 . C . . PASS BLOCKAVG_min30p3a GT:GQX:DP:DPF 0/0:33:12:1
chr1 12778 . C . . PASS BLOCKAVG_min30p3a GT:GQX:DP:DPF 0/0:33:12:1
chr1 12779 . C . . PASS BLOCKAVG_min30p3a GT:GQX:DP:DPF 0/0:33:12:1
chr1 12780 . C . . PASS BLOCKAVG_min30p3a GT:GQX:DP:DPF 0/0:33:12:1
chr1 12781 . C . . PASS BLOCKAVG_min30p3a GT:GQX:DP:DPF 0/0:33:12:1
chr1 12782 . C . . PASS BLOCKAVG_min30p3a GT:GQX:DP:DPF 0/0:33:12:1
chr1 12783 . C . . PASS BLOCKAVG_min30p3a GT:GQX:DP:DPF
chr1 12783 . G T 63 PASS SNVSB=0;SNVHPOL=2 GT:GQ:GQX:DP:DPF:AD