Closes #4 - .6 DONE - Include SIGUA identifier to Issue model

DONE #4.6.1 - BO & TO - Include attribute
DONE #4.6.2 - BD - Include field
    * Using JPA 2.1 annotations + DataNucleus schema create

DONE #4.6.3 - DAO jdbc MySQL - Update CRUD

Also prepopulated Issues with idSIGUA.

Also tested fetching all Issues
Also tested changing status