Fix UML stats

• Align UML stats with Fig. 4 in the paper

Better UML support

• Graphs for UML
• Stats for UML

Graph support

• Provides graph versions of the models in JSON format

Text dataset improvements

• Improve the text-based dataset to avoid tokenizing more than necessary
• Ignore EAnnotations

First version

Initial release containing:

• Database with labels for Ecore
• Database with labels for UML
• Raw models for Ecore and UML
• Text files associated to the raw models
• Scripts to analyse the models and to generate text files