Errata in v1.6.1

[Tim McCormack]

Tutorial: More fun with labels: Changing Section 2 to a Subsection in a new 
Section does *not* update the rendered text to "Subsection 2.1" -- it only 
updates the reference itself, resulting in "Section 2.1".

Tutorial: 5.2 LyX for LaTeX Users: "The the Extended Features"
 - Tim McCormack