15 December, 2007
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* Updated the book addition code to give some more sensible defaults.  This
allows it to work, more or less, in PHP5 with the new version of PostgreSQL.
It's now necessary that all "real number" fields have SOME value, rather than
being entered as null.
* Added a way to delete authors.  This is very untested, and hacked together.
Don't expect it to work reliably.

22 July, 2005
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* added four genre types: non-fiction, cookbook, manual/how-to, and other


5 May, 2005
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* ' no longer breaks mod_form.php or modbook.php
* Prices in mod_form now have the $ stripped.
* ' should no longer break add_form.php or addbook.php - UNTESTED

28 April, 2005
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* got the modify command working.  This required (or at least was simplified by)
  a change to the db:  loaned_to is now a text field, not a date.

27 April, 2005
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* fixed guest login.  It's now possible to log in and browse a database, but
  only if it has been set to be guest-readable.
* guests can no longer add books or use the modify command.  Ah, security.



Before 27 April, 2005
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* Login complete except for guest account.
* main page usable, though it will still need tweaking.
* book entry page usable, though I may modify it slightly.
* book listing works correctly, and has a modify button included, though not 
  "hooked up."
* added "home" and "Log off" links to the navbar.
* added a link to the navbar at the top of the page
* lots of tweaking of the main page.