Always show vertical scroll bar

Some pages at tup website have small size and fit a screen. Some other
pages need several screens - it makes vertical scrolbar visible.

Tup website uses 'rubber' layout and position of menu depends on width of
screen. When we switch between pages with/without scroll the menu position
shifts, it looks ugly.

Always show scrollbar to make screen width and menu position stable
during page browsing.
Update copyright year at the website