Location - Add optional NAME property for locations

Users have requested the ability to assign arbitrary 'names' to contact locations. The obvious use case is for personal address collections for a contact that might be used for Shipping (for example). So I might enter my mother's home address - location_type = Shipping, name="Mom's House".

1. Add new column - "name" to civicrm_location. VARCHAR(255) NULL.

2. Add `Location Name: [ ] field to create/edit contact form (after location type select, and before "Primary Location.." checkbox)

3. Display location.name value in contact/view in the fieldset legends (if populated)
<legend>Home - Mom and Dad</legend>

4. Location name should be importable, exportable, and searchable via Advanced Search (add Location Name field to this form in the right-hand columns (saw row as the Location Type checkboxes).