[sparql] add failing test for two entities with dc:title

[sparql] adding test for "rdf:type -> is"

proof read documentation some clarifications, some typo fixes, and a couple of other strings fixed on the way

skip flymake junk when reloading this avoids nasty ex aequo scores in selectors in dev. mode

merge back to stable some changes made on site for a customer.

[win32 SQLServer] connection lost detection The pyodbc driver when connected to SQLServer 2005 reports lost connections in a quite strange way, raising a pyodbc.Error exception with a specific exc.args value. This patch catches these and reconnect properly.

ldap: reset cache when a user is deleted When a user is deleted from ldap, reset both caches used by the source otherwise the search is not performed again and exceptions such as UnknownEid: No entity with eid 74078 in the repository will occur

ldap source logging Added some extra logging statement to understand what happens in the ldap source.

forbid looping tasks with an interval of 0 This severly harm the server, and generally are the result of a baaad configuration file. We want to stop the server asap when this is detected to give people a chance to fix the configuration.

/siteinfo page: display information about the names of the running threads