show tag trace in tag title
add tag-it plugin from github.com/aehlke/tag-it
tag picker with autocompletion

This is an UI enhancement.
Instead of showing tons of tags in one page, show only a text input
with suggestion. A user can quickly find necessary tags by typing
some characters of it.

Removed 'Tag' tab from all pages. Now tag assigning is performed on
'Properties' or 'Edit' tabs.

changes:
Removed saveEntityTags(), renderNewEntityTags(), renderEntityTags(),
    renderEntityTagsPortlet() functions.
    'editRange', 'updIPv4RSP' and 'updateFile' ops switched from
    tableHandler()
       to dedicated functions.
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
Merge pull request #53 from gescheit/suggest

Added tag picker with autocompletion