increase similarity of FalsePositiveVcf{,Denovo}.pm

code-deduplication: gsanders, mburnett
remove breakpoints

code-deduplication: gsanders, mburnett
create empty base class for FalsePositiveVcf*

code-deduplication: gsanders, mburnett
move object properties to base

code-deduplication: gsanders, mburnett
remove trailing whitespace

code-deduplication: gsanders, mburnett
move help to base

code-deduplication: gsanders, mburnett
make base class abstract

code-deduplication: gsanders, mburnett
move _get_readcount_line to base

code-deduplication: gsanders, mburnett
move make_buffered_rc_searcher to base

code-deduplication: gsanders, mburnett
move fails_homopolymer_check to base

code-deduplication: gsanders, mburnett
move read_counts_by_allele to base

code-deduplication: gsanders, mburnett
move add_filter_to_vcf_header to base

code-deduplication: gsanders, mburnett
move set_format_field to base

code-deduplication: gsanders, mburnett
move get_variant_for_sample to base

code-deduplication: gsanders, mburnett
move convert_numeric_gt_to_alleles to base

code-deduplication: gsanders, mburnett
move prioritize_allele to base

code-deduplication: gsanders, mburnett
move generate_filter_names to base

code-deduplication: gsanders, mburnett
move print_stats to base

code-deduplication: gsanders, mburnett
extract should_print_region_line method

code-deduplication: gsanders, mburnett
move print_region_list to base

code-deduplication: gsanders, mburnett