Formal definition of JAristaDialog to input edges

Changelog:

Camino - new Constructor with both origin and destiny
Digrafo - defined Vector method to provide information to ComboBox
Nodo - added representation for txt Output files
JAristaWindow renamed to JAristaDialog

JVentana - Refactoring, defined getPath, and input output operations
via JFileChooser

JAristaDialog - refactored, and changed to be changed dependent on the
type of dialog that is needed full or reduced. Event management
included and return value behavior added