Sorting accounts

[Leslie Katz]

I suppose this staring me in the face, but, if so, I've spent a lot of 
time avoiding it!

I have a file which consists of a series of accounts. When I created the 
file, I created each account in alphabetical order, a-z. Since then, I 
've added new accounts. Each new account I add takes its place at the 
end of the then-current list of accounts and I haven't found a facility 
to return the list to alphabetical order.

How do I restore alphabetisation?