Removing function 'multiplotfile' from module 'useful'. It's work is now done by function 'plotfile'.

Signed-off-by: Eduardo Tenorio <embatbr@gmail.com>
Uma mudança de 360 graus.

Signed-off-by: Eduardo Tenorio <embatbr@gmail.com>
Function 'create_gmm' in module 'gmm' completed. Plotting tests with M varying from 32 to 2048 (always doubling). Created file 'gmm_old.py' to let the old functions (that I will insert in 'gmm'). Added updated module 'main'.

Signed-off-by: Eduardo Tenorio <embatbr@gmail.com>