0.2.0

• New Factor hierarchy ( #74 ). Major changes are:
  • All factors are now interfaces.
  • For each factor we can have multiple implementations.
  • Factors are immutable now: the creation of a new factor is delegated to the constructor or to a dedicated Factory class.
  • SymbolicFactors can now be used to keep track of operations done by algorithms.
• Added code for isipta21benchamrk ( #76 #77 )
• Removed old methods marked as @deprecated