beginning to implement vcf parsing of SeattleSeq137 output
added multiallelic SNP handling for ESP data and changed to using alt allele frequency
changed filename
fixed error in parsing position
added line to clear storage of error/altfreq data

some variants aren't being annotated for unknown reasons because the
variant does exist in the error/maf reference file
improved speed of adding and fixed bug
changing compound het models to allow for non-sequenced parents
compound het can be run without parents

compound het mosaic needs parents genotyped
compound het model should now work with 1 parent missing
header column change
fixed bug in inheritance model input parameter parsing
make column header interpretation more flexible
WIP
vcf input implemented, need to create human-readable output format for vcf
implemented most SeattleSeq-produced vcf input/output parsing
combining SeattleSeq-produced vcf input/output and compound het with missing parents
finish merge
implemented multi-allelic site handling
created some subfunctions for parsing the input and header
created subfunctions to print logfile and switched to lexical filehandles