Changed the root package from net.sf.briar to org.briarproject.

briar-api/src/org/briarproject/api/db/ContactExistsException.java

@@ -0,0 +1,10 @@
+package org.briarproject.api.db;
+
+/**
+ * Thrown when a duplicate contact is added to the database. This exception may
+ * occur due to concurrent updates and does not indicate a database error.
+ */
+public class ContactExistsException extends DbException {
+
+	private static final long serialVersionUID = -6658762011691502411L;
+}