internal function for calcAdjPP for that gives list of covariance matrix of residuals for all trait pairs

internal function for calcAdjPP for that gives list of covariance matrix of residuals for all trait pairs

allC12(M, nummods, beta, SSy, Sxy, xcovo, Mx, Nqq)

Arguments

M	number of traits
nummods	list where component i is the number of models for trait i
beta	list of joint beta estimates for each trait
SSy	matrix of trait cross-products
Sxy	matrix with each column being the cross-product between SNPs and a trait
xcovo	covariance matrix of c("one"=1,X)
Mx	vector of SNP means
Nqq	has N[i,j] = no. with both trait i and trait j measured