Refactoring to use a factory for creating FilterControls
Updated Readme for maven building
Improve visual appearance on Windows.
Code refactoring.
added some interface methods to access filter configuration
refactored tests to make them more readable
renamed test for DefaultValues
implements tests for defaultValue fallback in IntegerFilterTest
fix bug in converting a non-set value

non-set values were converted from null to 0.0 which is wrong
implements tests for defaultValue fallback in RealFilterTest
implements tests for defaultValue fallback in BoolFilterTest
i18n of operators
Fixes compile error caused by interface change.
Number Support Complete
XHTML Support for search implemented
Implement Boolean Search Support
prevent NPE
Tests for default fallback in DateFilter
implemented a Unit Test
implemented Unit Tests and removed obsoltete stubs