serializeTags: include the tag itself into trace
fix ponentially harmful foreach => &$ref

fixed funcs:
printTagsPickerUl
enableTagsPicker
tags picker release notes
tags picker: fix dynamic CSS issue

'*' suggest used to create tons of dynamic CSS style each time the star was pressed.
Now there are predefined styles for each level up to 10. So the dynamic_style is removed.
tags picker: fix the A-tag's style inheriting