Renamed the Payee.{h|cpp} files to Partner (see issue #4).
Renames the PayeeManager.{h|cpp} to PartnerManager.
Renamed the PayeeTest files to PartnerTest.
Renamed the PayeeManagerTest related files to PartnerManagerTest.
Renamed the Payee class to Partner.
Renamed the PayeeManager to PartnerManager.
Renamed the payee to partner in the Database class.
Renamed the payee to partner in the Transaction.
Renamed the PayeeTest class to PartnerTest.
Renamed the PayeeManagerTest class to PartnerManagerTest.
Renamed the payee to partner in the HmReader.
Replaced the payee with partner in the TransactionTest.
Replaced the payee with partner in the HmReaderTest.
Replaced the payee with partner in the XmlWriter and XmlWriterTest classes.
Incremented the version of the XmlWriter.
Displaying the Partner string instead of the Payee.
Merging with the partner branch. Fixes #4.