This is usually because the file name was singular (*Service*) but the class name was plural (*Services*).
This is to make configuration easier rather than having to look in the c# code itself to find the slightly different name of the connector.
This does not affect existing configuration since the files are being renamed rather than the classes.
These are disabled by default, as before. Please only turn these on in secure grids, since they allow the same facilities as the existing SetPassword call (also disabled by default)
These facilities can be helpful when integrating external systems, in addition to the existing option of adapting an IAuthenticationService or using WebLoginKey