[trace] new tracing options to generate graph configurations for triva

details:
- triva/uncategorized:uncat.plist
          uncat.plist holds a configuration for a uncategorized
          graph resource utilization analysis in triva

- triva/categorized:cat.plist
          cat.plist holds a configuration for a categorized
          graph resource utilization analysis in triva

- Get a MSG/SimDAG/SMPI simulator, compile it against a toolkit
compiled with tracing enabled, then run the simulation with these
parameters:
--cfg=tracing:1 --cfg=tracing/uncategorized:1 --cfg=triva/uncategorized:uncat.plist
then run Triva (from the svn) with the following parameters
Triva simgrid.trace --graph --gc_conf uncat.plist --gc_apply

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/simgrid/simgrid/trunk@8990 48e7efb5-ca39-0410-a469-dd3cf9ba447f