* Update tests with better slices.
* GraphNode#addActionsAfterCall uses varargs instead of a set.
* Improved handling of super() and this() calls.
* ImplicitNode is now generic
* Improved interface in JSysCFG to insert new instructions ad-hoc.
* Constructors now have an implicit "return this".
* Removed JSysCFG#getDeclarationClass, ASTUtils has a similar method.
* VariableActions can now store (but don't propagate) a tree of fields acted
  upon.
* VariableActions can now take null as variable, or any possible expression.
* Automatic generation of the actions for fields (USE(a.x) generates USE(a)).
* Conversely, fields now either traverse their scope or declare an action.
* Handling of ThisExpr.
* Better initialization naming for fields.
* Implemented default initialization of fields if none is present.
* InterproceduralActionFinders:
  * Unified the behaviour of #initialValue()
  * Improved generation of actual-in/out for fields.

Caveats:
* InterproceduralActionFinders cannot process VariableActions that don't resolve
  into a ResolvedValueDeclaration. Thus, 'this' must be declared when entering a
  method or constructor declaration.
* Removed type from IO nodes, as it required resolving expressions and was
  unnecessary for the slicer.

* VariableAction stores the real name and the variable may be null.
* VariableVisitor entrypoint must be #startVisit().

Updated variable_pattern_regex to match VariableActions regarding object fields accessed in different ways

Fix github#44 (-i flag misbehaving)

Closes #44

See merge request !54

Replaced by linear lookup.

Fixes #44

Interprocedural DynamicTypeResolver

Closes #45

See merge request !53

* Closes #45
* Alters VariableAction to take Expression as argument (either NameExpr or FieldAccessExpr).
* Expands the CallGraph API
* Fixes bug where movable definitions were created incorrectly.
* Now accepting FieldAccessExpr completely.

Polymorphic call graph

See merge request !51

* Fix for SlicerTest: use StaticTypeSolver.
* CallGraph#getCallTarget is now plural.
* CallConnectors edited to iterate over targets.

# Conflicts:
#	sdg-core/src/main/java/es/upv/mist/slicing/graphs/ClassGraph.java
#	sdg-core/src/main/java/es/upv/mist/slicing/nodes/VariableVisitor.java
#	sdg-core/src/main/java/es/upv/mist/slicing/utils/ASTUtils.java