Fix things until the end of section 3

Also heed the vim LaTeX warnings for typography related things. In
general, why not use \textit{text} rather than {\it text}?
Fix things until the end of section 4
Fix e.g.s

There is no need to put : after e.g.
Update the renewcommand to include the trailing space to avoid "gluing"
it to the following words.
Fix things until the end of section 5
Fix things until the end of section 6.
Fix things until the end

Now let's perhaps go through it again and try to understand something ^^
Last one for tonight.
Present sections in intro (+ refs), + one missing ref
Remove extra \/ after scoped env {\it …}
Improve references, quotating
Final reviews (part 1)