Add whole processus binding support on Linux

[ompiteam]

This can be implemented by enumerating /proc/{,self}/task/*, bind them, enumerate again to check that none have appeared in between.

[ompiteam]

Imported from trac issue 24. Created by sthibaul on 2009-11-25T11:28:35, last modified: 2012-12-22T02:49:34

[ompiteam]

Trac comment by bgoglin on 2009-12-30 07:25:55:

(In [1543]) (try to) properly use the new whole-process binding facility on Linux:

• hwloc_linux_set/get_proc_cpubind() now use hwloc_linux_set/get_pid_cpubind()
  when the THREAD flag isn't set, instead of only when PROC is set
• hwloc_linux_set/get_cpubind() now uses hwloc_linux_set/get_proc_cpubind()
• Add hwloc_linux_set/get_thisproc_cpubind() using hwloc_linux_set/get_pid_cpubind()

All binding modes are now supported on Linux.

This commit fixes #24.