Before setting the inoculum, one can use getMatrixGenePatho(),
getMatrixCultivarPatho(),
getMatrixCroptypePatho() and getMatrixPolyPatho() to acknowledge which
pathogen genotypes are compatible to which genes, cultivars, croptypes and polygons.
Once setInoculum() is used, one can call inoculumToMatrix() to get
the inoculum as a 3D array (1:Nhost,1:Npatho,1:Npoly)