add a list of URLs for authors, books and editors

[DeveloppeurPascal]

Change default behavior for url : the 'url' field is the principal website linked to author, editor and book.

Add a URL List property with 'Type, URL, Title and Text' : the Type will be a list of social network or other websites with logos in the database.

• change the DBAdmin program
• change the WSBuilder program
• add keywords in templates and the generator
• add the new property in the API (template, "common" files, ...)