added test database

[EvenSol]

Added a database that will only be used for testing

[EvenSol]

Implemente NeqSimTest base class.
NeqSimTest base class used to set all tests to use test database. All tests set to extend NeqSimTest class.

To change database - update
neqsim.util.database.NeqSimDataBase
.setConnectionString("jdbc:derby:classpath:data/neqsimtestdatabase");

Test classes that does not extend NeqSimTest will use the standard NeqSim parameterdatabase: data/neqsimdatabase

[EvenSol]

/**
 * 
 */
package neqsim;

import org.junit.jupiter.api.BeforeAll;

/**
 * @author ESOL
 *
 */
public class NeqSimTest {
  public NeqSimTest() {
    //Setting NeqSim to use test parameter database
    neqsim.util.database.NeqSimDataBase
        .setConnectionString("jdbc:derby:classpath:data/neqsimtestdatabase");
  }
}