implementation of dwg 12, 13, 14.
This commit was manufactured by cvs2svn to create branch 'v10'.
Actualizado desde el HEAD.
refactoring of blocks
refactoring to optimize and simplify the code
Refactoring general para evitar dar tantas pasadas en la carga, y para incrementarla legibilidad del codigo (demasiados if-else-if en vez de usar polimorfismo)
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