Refactor - Refactor the SiadapUniverseWrapper - the SiadapGradePredicate must be broken down, and others (?)

[joantune]

Due to pressures and what not, the SiadapGradePredicate became a massive predicate, which makes it very difficult to correct bugs like the one stated in #26. In order to correct this bug and to make future modifications easier, this predicate should be broken down into different predicates instead of a big parameterizable one.