ni_nitdoc: Content to Full-Index page

Adding a function to insert the content of the ful-index page

Signed-off-by: Stefan Lage <lagestfan@gmail.com>
ni_nitdoc: Adding to generate Module column

Adding a function to generate a column which contain all mmodules
included/concerns in a program

Signed-off-by: Stefan Lage <lagestfan@gmail.com>