Added @Bindable annotation to name property getter/setter.
This fixes the problem in xul/gwt of displaying proper names in the TimeLevelType menu list.
Changed implementation of hiding the "clear" button for ordinalColumn.

Added blank button for layout purposes.

For now, make toString() return getName() in order to make the gwt menulist work.
TODO; need to figure out why adding @Bindable isn't enough.
Merge pull request #26 from rpbouman/BISERVER-8010

Biserver 8010