Current HGVS extraction should also take into account integerValue attribute

[apriltuesday]

For example:
<Attribute Accession="NC_000010" Version="10" Change="g.102770293_102770294insGCTGCGGCTGCGGCTGCGGCTGCGGCTACGGCTGCG" Type="HGVS, genomic, top level, other" integerValue="37">NC_000010.10:g.102770293_102770294insGCTGCGGCTGCGGCTGCGGCTGCGGCTACGGCTGCG</Attribute>

Here `integerValue="37" indicates it refers to a previous version of the assembly, despite the type not being set to "previous" as we might expect (see here in the code).