[FM Discuss] Further sections needed in the Introduction to the Command Line

[Andy Oram]

I decided it was bothering me that some important structural information was missing:

  Configuration files
  Functions
  Sourcing in files

So I added sections on these to the CUSTOMISATION chapter. Feel free to review it.

I really don't have time before April 8 to do more writing, but I'll try to review major changes (including Ed's).

Andy