Error codes below 255
Easier configuration of the hpg-var-effect tool parallelism
Multi-phenotype file save in stats. Changed prototype calls.

Changed ped_close to add one parameter. See libs/bioinfolibs/bioformats/ped/ped_file.c
--version command-line argument
Added argument "--phenotype-field=<string>"
SNP ID shown in GWAS application output report
Refactoring of function that queries for the effect of a mutation
Refactoring of functions that query for mutation and SNP phenotypes
Functions from hpg-var-effect that perform the requests to CellBase and init/free buffers moved to bioinfo-libs
Static variables in effect_runner made local
Annotation of VCF INFO field moved to bioinfo-libs
Block reading a file when it is ahead the least common merged position (improves memory usage by 100x, 2x speed-up)
Option 'entries-per-thread' removed
Option --log-level (-l) added, logging can be disabled by using -l nothing
Fixed behaviour of parsing regions (for filtering) from command-line
Added newline to message that used logging functions without variable arguments
Added variable-grouping and control-case considerations.
Merge branch 'next' of github.com:opencb-hpg/hpg-variant into multi-phenotype-stats

Conflicts:
	src/vcf-tools/merge/merge.c
	src/vcf-tools/stats/stats_options_parsing.c
Finished implementation of multi variable stats
Merge branch 'next' of github.com:opencb-hpg/hpg-variant into next