(1) Store the phonebook in a smarter fashion, perhaps an AVL search
tree, to account for sites with massive phonebook needs.  This should
speed up the look-up times for large phonebooks nicely.  Also, store
the data in an encrypted (less human-readable) format eventually.

(2) Develop a user front-end for the phonebook, essentially a
phonebook editor which would allow users to add, edit, delete, list,
print, and search the phonebook without having to muck around with a
text editor.

(3) Move compile-time options like LDPERIOD and MAXTRIES from config.h
to fax.rc, since they don't need to be hard-wired.

(4) Write a decent install/configure script to automate the setup
process so that we don't need another 15-step install guide (sigh).
