Adds option to remove all member pics older then ugalleryage!

Installation instructions:

* Make a backup first (in case something doesn't work right!)
* Copy files to appropriate directories.
* Go to the User Gallery Mod Setup and update the Gallery Age field.
The number is the age in days that files will be removed if older then.
Adjust toyour needs. if the value is < 7 days or doesn't exist, no files will
be removed.

Usage:  The admin user will now have an additional menu item called
"Clear Old Pictures" in the Gallery Admin Tools.  Selecting it will
clear all the pictures older then galleryage.  It will print the name of each
picture removed (with age) and a final cout at the end.

by SafePit (Steven Reid)
for WebAPP v0.9.9.3.4 NE (http://www.web-app.net)
SafePit@web-app.net or steven@reids4fun.com
