Temporarily re-establish the doc of Constraint* classes.

gen_doc/Doxyfile.in

@@ -520,7 +520,8 @@ EXCLUDE_SYMLINKS       = NO
 
 EXCLUDE_PATTERNS       = *faust_MatDense_gpu.h *faust_MatSparse_gpu.h expfiltered*
 
-EXCLUDE_SYMBOLS = mtimes_trans subsasgn get_factor_nonopt reshape ABC ParamsPalm4MSAFGFT UpdateCholesky UpdateCholeskyFull UpdateCholeskySparse greed_omp_chol hierarchical_constends palm4msa_constends ConstraintGeneric ConstraintMat ConstraintReal ConstraintName ConstraintInt is_mat_consistent init_facts stop_crit ParamsPalm4MSAFGFT data_num_cols data_num_rows is_fact_side_left stop_crits constant_step_size constraints DISABLED_OPT EXTERNAL_OPT grad_calc_opt_mode init_lambda INTERNAL_OPT is_update_way_R2L is_verbose num_facts step_size IDX_IS_FACT_SIDE_LEFT OPT_ARG_NAMES2 OPT_ARG_NAMES DEFAULT_OPT IDX_USE_CSR IDX_NORM2_MAX_ITER IDX_NORM2_THRESHOLD IDX_GRAD_CALC_OPT_MODE IDX_VERBOSITY IDX_CONSTANT_STEP_SIZE IDX_STEP_SIZE IDX_INIT_LAMBDA IDX_IS_UPDATE_WAY_R2L set_FM_mul_mode set_Fv_mul_mode implements HANDLED_FUNCTIONS __array_ufunc__ __array__ __array_function__ asarray check_dev
+EXCLUDE_SYMBOLS = mtimes_trans subsasgn get_factor_nonopt reshape ABC ParamsPalm4MSAFGFT UpdateCholesky UpdateCholeskyFull UpdateCholeskySparse greed_omp_chol hierarchical_constends palm4msa_constends is_mat_consistent init_facts stop_crit ParamsPalm4MSAFGFT data_num_cols data_num_rows is_fact_side_left stop_crits constant_step_size constraints DISABLED_OPT EXTERNAL_OPT grad_calc_opt_mode init_lambda INTERNAL_OPT is_update_way_R2L is_verbose num_facts step_size IDX_IS_FACT_SIDE_LEFT OPT_ARG_NAMES2 OPT_ARG_NAMES DEFAULT_OPT IDX_USE_CSR IDX_NORM2_MAX_ITER IDX_NORM2_THRESHOLD IDX_GRAD_CALC_OPT_MODE IDX_VERBOSITY IDX_CONSTANT_STEP_SIZE IDX_STEP_SIZE IDX_INIT_LAMBDA IDX_IS_UPDATE_WAY_R2L set_FM_mul_mode set_Fv_mul_mode implements HANDLED_FUNCTIONS __array_ufunc__ __array__ __array_function__ asarray check_dev
+# ConstraintGeneric ConstraintMat ConstraintReal ConstraintName ConstraintInt
 
 # The EXAMPLE_PATH tag can be used to specify one or more files or 
 # directories that contain example code fragments that are included (see