Fix missing ch6 subsection and TOC entry

I think there was an issue with the pandoc app converting html to LaTex for chapter 6.
Specifically with the missing subsection tag. This in turn caused the TOC to get generated
without chapter 6 referenced. This has been corrected as well as some cleanup to the
TOC file (delete  subsubsections) as well as taking the center tag out of pointers.htm

ptrtut13-1.5.zip
ptrtut13-1.5.tar.gz
pointers-and-arrays-in-c-jensen-1.5.pdf

This release introduces the usage of LaTex to create the various formats, most especially PDF. I also created src code for the various programs included in the tutorial that can be compiled run. They are also included into the tex files for each chapter.

This release is primarily for the Markdown version of the tutorial as well as some directory reorganization.

This is version 1.2 of Ted Jensen's Tutorial on Pointers and Arrays in C. Ted took his website down and this is I believe the latest version of his tutorial.