Redmine

This patch adds a "Contact" tab to the normal user edit page, and within this provides a mailing address list and phone number list; many addresses and numbers may be added to a user based on locations such as "home," "work" etc. I'm not sure if this is completely within the scope of the project, and, but I provide it as is with the hope that it's useful.

The changes from #1628 are roughly as follows

• A migration adding a table to hold address and phone number data.
• Several model classes to represent extended contact data:"Address", "PhoneNumber", "ImAccount" and "ContactUrl". These inherit from an "AddressMultiValue" base ActiveRecord class and all use the single table added by the migration.
• A tab is added to the user view helper code, along with a partial for viewing the contacts
• Simple views for adding new contacts and addresses
• Unit and functional tests for these, with some fixtures

Some things that could be done to improve this further include:

• Allow editing of addresses and phone numbers; at this time you may only add new or delete existing.
• Import from CSV or vCard
• Export to PDF/CSV/vCard
• Provide a list of default location values thru a combobox