some fixes in omx_multithread_wait_any
some fixes in omx_multithread_wait_any

in the usage message :
    moved the -t option in the receiver specific section

fixed the exit value of the sender processes.

ananos/xen2mx,ananos/open-mx,ananos/open-mx,ananos/xen2mx,ananos/open-mx,ananos/xen2mx,ananos/xen2mx