This change the semantic of the timed function. The behavior depends now of the value...

the timed function have the behavior of a try function. For example, to try to lock a mutex you must call the xbt_os_mutex_timedacquire() function with the parameter delay/timeout set to zero.
Finally, if you specify a delay more than zero, the timed function try to acquire the lock until the delay was expired, which is the normal behavior of the function.

Remark : the changes of the other files are the consequence of this new semantic : because the timed functions also implement the behavior of the try functions, theirs declarations and theirs definitions are removed.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/simgrid/simgrid/trunk@4874 48e7efb5-ca39-0410-a469-dd3cf9ba447f