Branching fractions and CP asymmetries in B-0 ->pi(0)pi(0), B+->pi(+)pi(0), and B+-> K+pi(0) decays and isospin analysis of the B ->pi pi system RID A-8798-2012 RID C-5223-2009 RID C-5719-2008 RID D-1055-2009 RID A-2675-2009