3.2
1. Support for the symto-thermal method added.
2. Windows initial positioning bug fixed. If the window opens beyond the screen
   its position and size are reset to default.
3. The fertility prediction was improved.
4. Some core methods were refactored even more.
5. Unit tests coverage increased to the reasonable level.

3.1
1. Internationalization support improved.
2. Ukrainian translation added.
3. Password protection for the pcal files are now available.
4. Possibility to record pregnancy interruption added.
5. Disclaimer is displayed on the first application start that Periodic 
   Calendar can only be used as a tracking utility, but not as a contraceptive tool. 
6. Unit tests for the application core modules created.
7. Some core methods were refactored to make the code support easier.

3.0
Project was rewritten in Java. Functionality generally kept the same. See the application online 
help for more details.