[web2py] w2b2py book command-line examples

[Jonathan Lundell]

In Chapter 6 (DAL), there are a lot of command-line examples (with >>> prompts) 
(side note: a lot of them aren't properly formatted). It'd be helpful to 
readers if at least once (say at the top of the chapter) the python command 
used to get to the prompt were shown. Presumably it involves -S, -M and maybe 
-N? At any rate, a reminder would be welcome.