Test the URL and Label templates to format fields

[mastropi]

This implies testing the functionality originally present in Kibana where field values could be formatted as images or pre-defined labels.
Example: a value with three possible values could be shown using the image of a semaphore taking the colors green, yellow, and red. The images are taken from a specified URL.

The suggested process for testing is the following:

1. Create a kibella.sqlite file where the INCOME table is registered with a couple of fields having the format of a URL template and/or a Label template (using the appropriate columns in the RegisteredTables table.
2. The created kibella.sqlite file is stored in server hosting Kibella and the web application is tested to see if the values of the formatted fields in the INCOME table as specified in the RegisteredTables table are seen with the specified formats.