Changes

hwloc-ps: store all info about each process in a structure
By the way, sanitize the reading of thread info
(e.g. don't miss some names when intermediate threads are not bound).
Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>

hwloc-ps: separate the reading of proc/thread info from the printing
Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>

hwloc-ps: split the code reading proc/thread info to a separate file
Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>

hwloc-ps: add a generic iterator for each process
Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>

hwloc-ps: build a convenience library with common-ps.c
So that it may be used by other tools, including from other
directories, without causing strange dependency issues.
For the record, when directory foo/ builds its own ../bar/file.c, the
dependency file (.deps/*.Po) may be in bar/
(depends on subdir-objects being enabled/supported by automake). If
make distclean runs in bar/ before in foo/, it removes bar/.deps/*.Po
and thus breaks make distclean in foo
(because foo/Makefile requires the remote .Po file).
Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>

hwloc-ps: convert from hwloc_pid_t to Unix pid in case we ever work on
Windows
Stolen from lstopo --top.
Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>

hwloc-ps: add a flag to the internal API to return short program names
Stolen from lstopo --top
Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>

lstopo: Implement --top using common-ps.[ch]
Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>