shr.el (shr-render-td): Only do colours at the final rendering. Should be slightly...

shr.el (shr-render-td): Only do colours at the final rendering. Should be slightly faster.
 (shr-insert-table): Fix up TD background colours when doing the vertical padding.
gnus-art.el (article-update-date-lapsed): Don't use current-column to find the horizontal position.  It's fragile in the presence of \003 characters.