Given a site and a user ID, return the appropriate site or section title for the user.
SAK-29138 - Takes into account 'portal.use.sectionTitle' sakai.property;
if set to true, this method will return the title of the section the current
user is enrolled in for the site (if it can be found). Otherwise, it will
return the site title (default behaviour).
site - the site in question
userID - the ID of the current user
siteProviders - the providerIDs associated with this site; they will be queried if this parameter is null