Function_compl:
Move stuff around. Add and prove Rg_ext, surj_ext, surj_comp_{compat,reg}. Function_sub: Add and prove surjS_id, surjS_has_right_inv.
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Move stuff around. Add and prove Rg_ext, surj_ext, surj_comp_{compat,reg}. Function_sub: Add and prove surjS_id, surjS_has_right_inv.