Add getMinimumDate and getMaximumDate method in RawObservation class
Add date range into ParameterSelectionPanel
Add error message and Change to select only one parameter in selection panel
Add calculation of basic statistics
Refactor application structure
Modify pom.xml for maven compiler, jar, assembly setting
Add IntelliJ GUI Designer package to pom.xml and Modify logging message
Modify chart font
Modify background color of JDesktopPane
Add save graph feature
Refactor TimeSeriesData structure
Add skeleton of custom analysis