Introduce typed tasks in SimDag
- Specify its kind and cost at creation.
- At scheduling, just give where it should be placed, and the cost for
each involved resource is automatically computed.
- Existing constructors so far (more to come of course):
- SD_task_create_comm_e2e() for end-to-end communication
- SD_task_create_comp_seq() for sequential computation
- Use SD_task_schedulev() / SD_task_schedulel() to schedule them.
git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/simgrid/simgrid/trunk@6725
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