Homogenize metamodel terminology and test cases fix

[suarezgpablo]

Includes two parts:

• The update of the schema evolution metamodel so the definition of schema modification are more consistent to each other. For example, the specification of a table to be altered was done differently in some of the schema modifications.
• Improved some test cases related to the consistency module where the initial data was not enough to fully test the data integrity. Also, three missing test cases that were in the script module but not in the consistency module were added to the latest as well as the neccesary intialization of the SQL files and the Benerator setup files. No modifications were required in the source code of MoDEvo.

After this pull request is reviewed and accepted, the first version of MoDEvo should be released.

[javiertuya]

@suarezgpablo First release created, no artifacts published in maven central.
Tag is: v1.0.0