Update of package classes.

Update of package classes.
Introduced a common base class for cuts and values, which allows to generalize the evaluation methods, and select the target "a posteriori".
Generalized the AliRsnValue computation with the addition of a generic cut support object which can be any TObject (this copes with the need
to have an AliRsnPair in some cuts related to the mother, and AliESDtrackCuts for multiplicity computation.
In processInfo adjusted some indentation and adapted also to PROOF.
Adapted some header comments and removed some useless methods.