Made the following changes:
	- Added scripts to add video items, audio items, magazines, and newspapers to the database. Made extra-special sure addBook works too. I also tested it with handling deletions from in the middle of the list of library codes and a couple other cases
	- modified inventory.php to support these changes, and to remove that audience slider. I replaced the slider with a dropdown menu.
	- added the dropdowns back and set the search field to be wider in catalogue.php
	- I also modified the width of the genre and audience fields to be 30 characters wide instead of 10 - I found 10 too short for some of the genres and audiences (ex. I couldn't use 'Historical Fiction' as a genre or 'Early Childhood' as an audience. I added the script I used to do this.