declared and installed the projective version of the comb. polynomials

. ProjectiveCharacteristicPolynomial
. ProjectivePoincarePolynomial
declared and installed ProjectiveChernSchwartzMacPhersonPolynomial
coding style
declared and installed LeadingCoefficientOfPoincarePolynomial

for divisors

(needs CombinatoricsForHomalg v2013.09.21)
installed an extra method for LeadingCoefficientOfPoincarePolynomial

for IsDivisor and HasCharacteristicPolynomial