formatted code
updated Fragment.onNodeHeaderClick to keep from toggling the content when clicking on the checkbox
#smart_layout: updated fragment.htm to support multi-column
updated css
#smart_layout: added margin to make the fragment toolbar visible in horizontal view at fragment.htm
#smart_layout: updated tag.htm to support multi-column for tags (not tag-fragments)
refined css
#smart_layout: updated user.htm to support multi-column for tags (not tag-fragments)