Include stack "p_num_termos"

Signed-off-by: Gustavo Toshi Komura <gtk10@c3sl.ufpr.br>
Change function "procura_simb" to return node another way

Signed-off-by: Gustavo Toshi Komura <gtk10@c3sl.ufpr.br>
Include stack "p_num_termos" on compiler header

Signed-off-by: Gustavo Toshi Komura <gtk10@c3sl.ufpr.br>
Use stack "p_num_termos" to count terms of the expression

Signed-off-by: Gustavo Toshi Komura <gtk10@c3sl.ufpr.br>
Execute make

Signed-off-by: Gustavo Toshi Komura <gtk10@c3sl.ufpr.br>