Disable warnings about deprecated functions for stable branch

Since this is a stable branch, we're unlikely to fix uses of
deprecated functions, so we shouldn't warn about them.
Don't check documentation completeness in this stable branch
Upload documentation to the 0.24.x location
0.24.0
nano version
stop hardcoding python's path in .py scripts

https://bugs.freedesktop.org/show_bug.cgi?id=76495
base-client: fix potential uninitialized variable bug
contact-list: don't crash if 'd' is NULL

https://bugs.freedesktop.org/show_bug.cgi?id=79006
account-request: remove useless 'priv' variable

https://bugs.freedesktop.org/show_bug.cgi?id=79006
test-connection-error: don't check errors twice

We are already using g_assert_error() to check those.

https://bugs.freedesktop.org/show_bug.cgi?id=79006
Merge branch 'telepathy-glib-0.24'
Merge branch 'master' into next

Conflicts:
	Makefile.am
	NEWS
	configure.ac
	docs/reference/Makefile.am
	tools/glib-client-marshaller-gen.py
tp-fs: add mising 'break' in switch block

https://bugs.freedesktop.org/show_bug.cgi?id=79006
ensure that class pointers aren't NULL

Make clang happier and is safer anyway.

https://bugs.freedesktop.org/show_bug.cgi?id=79006
logger: don't assume @error is not NULL

https://bugs.freedesktop.org/show_bug.cgi?id=79006
base-contact-list: add dummy TpContactGroupList typedef and cast macro
pass a TpContactGroupList to TpContactGroupListInterface vfuncs

That's the proper way to do it to keep gir happy.

https://bugs.freedesktop.org/show_bug.cgi?id=77772
pass a TpContactGroupList to methods dealing with groups

It's now an error to pass an object not implementing
TP_TYPE_CONTACT_GROUP_LIST to these two functions:
- tp_base_contact_list_normalize_group: only called internally from function
assuming the iface was implemented
- tp_base_contact_list_has_disjoint_groups: we were already checking if the
iface was implemented before calling it.
pass a TpContactGroupList to all the ContactGroups methods

https://bugs.freedesktop.org/show_bug.cgi?id=77772
rename most ContactGroups methods

https://bugs.freedesktop.org/show_bug.cgi?id=77772