Update the orterun/mpirun manpage. Corresponds to master commits:

open-mpi/ompi@91e9686
open-mpi/ompi@f9d620e

@jsquyres please review
Correctly move the pointer back by the true_lb.

(cherry picked from commit open-mpi/ompi@e3f74aca1c0482816e85da9f018872b7fe98e227)
Fix building system: correct libltdl check for advise capability.
Add following commits from master:

open-mpi/ompi@9529289
open-mpi/ompi@206eade
Merge pull request #36 from rhc54/cmr/update-orterun-manpage

Update the orterun/mpirun manpage. Corresponds to master commits:
Merge pull request #34 from artpol84/fix_ltdl

Fix building system: correct libltdl check for advise capability.
Merge pull request #29 from ggouaillardet/topic/coll_tuned_allgather_intra_bruck

Correctly move the pointer back by the true_lb.
vader: report errors to the upper layer

This is a backport of :
 - open-mpi/ompi@d60f0cbd8850ab8e4ee4a463872ae4c36031c2f7
 - open-mpi/ompi@75e8387a4ee20aeb0ef79ec342a7ebc4e1ff7d98