Efficient Sticky Notes 5.20 build 515

Custom fields for all modules, the fields can be defined as text, date, time, numbers or Y/N options. 2. Group/sub-group export and import are supported. 3. Export recurrence information are added in Task and Events modules. 4. (Network version) Access right "Modify task's info assigned by other users" has been added. Once SYSDBA (admin) sets this right to users, users can modify info of assigned task, otherwise, users can only set the progress and complete rate( can not modify other info) of assigned task.-->