Changes

contrib/completions: install in $(datadir)/bash-completion/completions

The old /etc/bash_completions.d/ is still available by
installing with something like:
  make install bashcompletionsdir='/etc/bash_completions.d

Thanks to Tomasz Kłoczko for the suggestion (see #413 for details)

Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>

contrib/completions: rename hwloc-completions.bash to bash/hwloc

No need to have "-completion" in the name.

Remove the .bash suffix so that the install path is similar to others
(renaming isn't trivial in automake).

Move to a bash subdirectory in case we ever ship a zsh completion file.

Thanks to Tomasz Kłoczko for the suggestion (see #413)

Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>

core: cleanup the insertion by cpuset API and error reporting

Our insert error reporting has never been very useful because
it uses __LINE__ from the error location, not from where the
caller performed the first insert call. Having a full backtrace
would solve this (see #223) but it doesn't work very well.

We now pass a "reason" string identifying the call point
(such as "linux:sysfs:package").
This removes the need for custom reporting error callbacks
(only used for distances groups anyway).

There's now a single hwloc__insert_object_by_cpuset() function
with root+reason (reason is mandatory) instead of one with
root+callback and one without.

The plugin ABI is bumped to 7.

insert_object_by_parent() doesn't get a "reason" argument
because it currently cannot fail. Hopefully we won't have
to change the plugin ABI because of this anytime soon.

Signed-off-by: Valentin Hoyet <valentin.hoyet@inria.fr>
Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>