[Phoenix] Sourcetagger improved

[Comiotto Thomas]

Hi all

I changed sourcetagger and friends to generate qualified location paths 
on the fly and refactored the xpath related code a bit.

It still lacks support for stylsheets that operate on node sets stored 
in xsl:variables. It also lacks support for updating  xhtml nodes in 
the current view that point to equal source nodes, e.g. in the calendar 
demo all calendar entries have a node that points to /calendar/@year: 
now if @year is changed, only the currently selected xhtml node is 
updated and one has to switch tabs (currently one even has to change 
the source to mark the model dirty) and back to update all 
corresponding xhtml nodes.

I could implement updating all xhtml nodes pointing to the same source 
node on the fly. But that would be quite expensive in terms of cpu 
performance, so a switch to enable/disable it would go to the xpath 
toolbar.

--
Bests
Thomas