mul_cond.cpp: copy version from cond_exp_1 branch.
mul_cond.cpp: copy version from cond_exp_1 branch.

kaskr/CppAD,wegamekinglc/CppAD,kaskr/CppAD,wegamekinglc/CppAD,wegamekinglc/CppAD,kaskr/CppAD,wegamekinglc/CppAD,kaskr/CppAD,wegamekinglc/CppAD,kaskr/CppAD