Added zip function

Started Forum at http://forums.oscommerce.com/index.php?showtopic=303380

If your site does'nt have the zip function ask your host to install it.
Other contribs use 'system' etc functions, these may be disabled on some servers for security, therefore I`ve used PEAR. Pear is included with PHP, however you will probably need to ask your host to install the 'archive_zip' PEAR extension: I`ve added an option in admin to turn on or off the zipp function, I`ve also written it so the function will only be called if it exists, so if its not there you will get an error, but it wont be fatal.

If you cant get the pear zip library installed, use version 2.2 of this contrib.

Backup only occurs with registered admin for security.
If a old backup less than maximum age does`nt exist, last backup is kept.
IE with 'Backup Save Interval' set to 12Hrs a archived backup is created every 12Hrs.

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