* Adding @GeneratedValue to @id colum
* Added informations to persistence.xml
* Changed settings in PreferencesSaveHandler
* Added derby product

NOTE: VMArgument added -DREFRESH_BUNDLES=true Without this there seem to
be some race conditions.

NOTE: Next commit will create a new test bundle for derby support.

* Added a new "savePerson" toolbar button for Derby access.
* Catch exceptions when creating a new EntityManagerFactory
* Changed driver name to use `org.eclipse.gemini.dbaccess.mysql` bundle
from _org.gjt.mm.mysql.Driver_ to _com.mysql.jdbc.Driver_
* org.eclipse.gemini.driver.mysql bundle is now a plugin instead of a
fragment


NOTE: This must be added in the 
`org.eclipse.gemini.dbaccess.mysql` bundle in the
Activator.start method:

/* ======== */
props.put(DataSourceFactory.OSGI_JDBC_DRIVER_CLASS,
MySqlServiceProperties.MYSQL_DRIVER_CLASS);

Conflicts:
	org.eclipse.gemini.ext.di/src/org/eclipse/gemini/ext/di/impl/GeminiEMFSupplier.java

…GeminiJPA.git into EmbeddedDerby

NOTE: bundles required as optional won't be resolved properly in e4.

Removed some trace calls.