Constructor for subclasses

Added constructors to House, Apartment, TenancyContract and
PurchaseContract to make a special instance from an instance of its
superclass.
Updatet cli.bat.
Added Contract to Orm.getAll(Type)

02/src/de/dis2017/data/db/ORM.java

@@ -55,6 +55,9 @@ public class ORM {
                 case ESTATE:
                     objects = processEstates(rs);
                     break;
+                case CONTRACT:
+                    objects = processEstates(rs);
+                    break;
             }
             rs.close();
             pstmt.close();