adding non_merged_vcf file data to crispr es qc
Added new controller methods for non merged vcf file
refactored subroutines for serving files relating to a crispr es qc well, using chained methods.
better handling of results with no alignments
changed to new chained links, added link to non merged vcf if available
Merge branch 'devel' into crispr_qc_vcf
v0.227

    Attempt to merge variants in target region VCF file for crispr es qc.