update build common (includes cairomm now)
add venn diagram drawing to vcf-compare-gt
add support for venn diagrams with 2 sets
cmdline validation for vcf-compare-gt
reverse order of column names in vcf-compare-gt

the output rows are binary like 0 0 1, 0 1 0, 0 1 1, ...
the value 1 actually corresponds to the first file, so the last column
refers to the first file.
remove graphics lib
add isFiltered method to vcf entry.
add allButSamplesToStream to vcf entry

prints everything but sample data
SampleData class updates:

1) use hash instead of tree for caching genotypes
2) add "appendFormatField / appendFormatFieldIfNotExists"
3) add sampleToStream to print a single sample
test allButSamplesToStream (Vcf entry)
make genotype comparator keep track of entries
include boost source instead of tarball
missed some parts of boost
add toString method to StreamJoin
add test for genotype comparator
fixup genotype comparator test

bad merge!
add ostream operator<< for RawVariant
add formatToStream() to SampleData

to print only the FORMAT fields for a vcf entry
print format fields in VcfCompareGT report