Replace yapc-to-fpc BASH script for a PYTHON script (works better, less problems)

Signed-off-by: Eduardo L. Buratti <elb09@c3sl.ufpr.br>
Add expected output for test #28

Signed-off-by: Eduardo L. Buratti <elb09@c3sl.ufpr.br>
Fix nivel_lexico when writing to a return value

Signed-off-by: Eduardo L. Buratti <elb09@c3sl.ufpr.br>