粒子で定義された計算結果の出力を開始する
call cg_iric_write_sol_particlegroup_groupbegin(fid, name, ier)
ier = cg_iRIC_Write_Sol_ParticleGroup_GroupBegin(fid, name);
cg_iRIC_Write_Sol_ParticleGroup_GroupBegin(fid, name)