Schema change for recent callgraph support additions

[Maynard J. <may...@us...>]

The addition of the XML output functionality for opreport is being used 
already by several GUI tools, in spite of the fact there's not been an 
official OProfile release yet that includes this function.  Now, with 
the recent (May 21) schema changes to support callgraph, those tools 
will break unless they can detect that a given XML instance was built 
using the updated schema.  A schema version change to "2.0" seems 
appropriate, and I'd be happy to make a patch to effect that change (in 
doc/opreport.xsd and libpp/xml_utils.cpp).  On the other hand, an 
argument could be made that the version of the first official release 
should be "1.0", and tools that have been using unofficial patched 
oprofile code will just have to deal with it.  I lean towards updating 
the schema version.  Opinions?

Regards,
-Maynard