Small API change in SilvaNews

Hi!

The latest release of SilvaNews (SilvaNews-1.2 for Silva 1.2, currently 
only available in the Silva-1_2-extra-2.tar.gz package) contains a small 
API change that will break custom public views: the 'lead' and 
'subheader' methods of News items (PlainArticle, PlainAgendaItem) are 
replaced by a single method called 'get_intro'. This method shows the 
first bit of a News item rather than the first subheader and the first 
lead paragraph, so it no longer enforces a structure of the news items.
Due to an error on my side (it was a bit of a rush job to get that 
on-line) the API change isn't mentioned in the HISTORY.txt, so that's 
why I thought it would be good to mention it here. Note that this is 
only interesting for people that wrote custom public views for News 
items, so if you didn't do anything special with your News instance 
everything will work fine.

Cheers,

Guido