Fix typo:

Corrected the the test class added to test suite of EncodedsPackageTests
added more tests

total tests 2325
line coverage: 58.8
branch coverage: 48.6
remove duplicate test suite AllTestSuitesTests.java

Test suite for project found in
org.jfree.chart.junit.JFreeChartTestSuite. This is the test suite that
includes other test suites of each package.
Remove MouseWheelHandlerTests

This was meant as a placeholder for the test class of MouseWHeelHandler.
However as this class is package-protected, can really directly test the
class.
added few more tests majority on org.jfree.chart.annotation package

total test: 2338
line coverage: 59.3%
branch coverage: 49.3%