1) Add fNPlanes to the new THcScintillatorPlane so the fTotPlanes is filled

properly with 4. Before it was filled with 1,2,3,4 for each plane 1,2,3,4
2) Only if fTofUsingInvAdc==1 the read database for hodo_pos_invadc_offset, hodo_pos_invadc_linear
,hodo_pos_invadc_adc, hodo_neg_invadc_offset, hodo_neg_invadc_linear
,hodo_neg_invadc_adc