Many modifications and experiments, need to grab a portion of text
(delimited by special marks) from input file.
Got a way to print lines of start and end of each question.
Just some data file to work with.
Just some random code to refresh my small knowledge on PERL.
Excluded entrada.tex and made a new sample file named master.tex
This version is capable of permutation of questions.

TODO: write functions for doing this and write alternatives permutation within each question. To clean up all the mess on the code, of course.
Just removed this files: entrada.tex was replaced by master.tex and saida.txt was related to random code at experiments.pl
Excluded tracking of LaTeX generated files and automatically-created prova-*.tex files.
Put a virtually real exam, with 4 test, 5 alternatives on each.
Many changes:

1) Renamed file to test_span.pl;
2) Wrote subroutines/functions to do most of the job;
3) Cleaned up *some* mess around.

To do:

Check the code for typos on output and clean up the remaining mess.
This files was renamed to test_span.pl as described on project README
file.