Add telephone number to shipping & delivery addresses

[michael_s]

The following modification is based on contrib #1868 (OsCommerce Address Book Enhancer add-on) made by Ryan Hobbs.

This is a lighter version of the Address Book Enhancer mod. This mod just adds a second street_address, telephone & fax fields to the address_book table without modifying the whole address_book process.

This allows for the customer to set a 2nd address field, telephone number & fax number to the delivery and billing addresses when they checkout.

This mod also changes the way phone numbers are stored in the database.

Originally contrib #1868 changes the way the address book works by allowing customers to set entry_names on their address book entries. Contrib #1868 also modifies the way the DOB and customer gender are handled.

This mod does exactly the same as #1868 without changing the way the address book works. It's quickier & easier to install than #1868... that is if you only need additionnal fields to the address book without the whole entry_name dropdown widgets!

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