Fix bug #1195459 Add sec to Cells chapter

Load cell data from a configuration file

Cells optionally configured through a JSON formatted file

Added a sample file and a feedback sec

Added programlisting language and removed extra white space

Patchset 5 puts in a <?dbhtml stop-chunking?> instruction
so the output file names will remain the same despite the
simplesect markup change.
Also removes a feedback section that is generic.

Change-Id: I05f74ebe7a0bae743b3b7f40215c3eb57ab38f66
Merge "Fix bug #1195459 Add sec to Cells chapter"