RFE #1069397 Add new parameter simplesect.in.toc

RFE #1069397 Add new parameter simplesect.in.toc

	  - default value of 0 causes simplesect to be omitted from TOCs
	  - to cause simplesect to be included in TOCs, you must set the
	    value of simplesect.in.toc to 1

	note from Norm:

	  Simplesect elements aren't supposed to appear in the ToC at
	  all. Ugh. The Definitive Guide doesn't really explain that
	  very well.

	  The use case for simplesect is when, for example, every
	  chapter in a book ends with "Exercises" or "For More
	  Information" sections and you don't want those to appear in
	  the ToC.