code cleanup in an method for ExteriorPower
code cleanup in ExteriorPowerOfPresentationMorphism
cleanup in gap/ExteriorAlgebra.{gd,gi,xml}
temporarily added RadicalSubobject to

intrinsic_attributes_specific_shared_with_factors_modulo_ideals
created SymmetricAlgebra.gd/.gi

among other things:
declared and installed SymmetricPower