Native PDD handling instead of cudd-patching.

Initial version, pdd structure from bdd and a simple eval function.

Reduce propagates propability products down to ONE node for efficiency.
Just comments...
Merge branch 'master' into pdd-native
Moved comments
Merge branch 'master' into test-nopdd
Fake bddSetProb
Rudimentary test of BDD-print and pdd-testing
Merge branch 'test-nopdd' (lost changes that was meant for master)
Undid the test-nopdd changes and kept "Bewares!!"