Number of individuals in a pedigree
nIndividual returns number of individuals (individuals and/or
ascendants) in a pedigree object.
character, which id column should be the source: "id" (default) or particular ascendant i.e. "father" and "mother"
logical, extend pedigree
logical, drop unused levels in case factors are used
FIXME - this will change a lot!!!!
There is always one additional level in levels in case factors are
used to represent individuals in a pedigree as described in
nlevels.Pedigree prints out
the number of levels actually used to represent individuals i.e. level
unknown is not included into the result.
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