Updated xPLLib 5.2 and SMS application 1.2.25

During the development of the experimental UPnP gateway, I ran into more bugs in the xPLLib, some pretty serious ones to be honest. So as of yesterday the new version is available.

The SMS application remains functionally the same, its only updated because it might be affected by the bugs fixed in the new lib.

Check the xPL page for the details and downloads.