Retrive softclipped reads

[sb43]

vafcorrect will miss the reads where read has only soft-clipped bases within the 'region' considered for overlapping read retrieval.

Possible fix is to extend 'region' boundaries:

vafCorrect/perl/lib/Sanger/CGP/Vaf/Process/Variant.pm

Line 572 in 22b2b33

sub _fetch_features {