Adds option to remove all member pics older then galleryage!

Installation instructions:

* Make a backup first (in case something doesn't work right!) Specifically,
make a copy of index.cgi, config.pl and config.dat!
* Copy files to appropriate directories.
* Add a linke to config .dat:
galleryage|90
The 90 is the age in days that files will be removed if older then.  Adjust to
your 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" at the bottom of the Galleries list.  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
