Sub-directories inside gio/ already processed in a previous commit:
- fam/
- gdbus-2.0/ (which contains only codegen/)
- gvdb/
- inotify/
- tests/
- win32/
- xdgmime/

Other sub-directories inside gio/:
- completion/: no license headers
- kqueue/: not LGPL, BSD-style license

https://bugzilla.gnome.org/show_bug.cgi?id=776504

See https://developer.gnome.org/hig/stable/typography.html

https://bugzilla.gnome.org/show_bug.cgi?id=772221

This makes them easier to identify when debugging and profiling.

This patch was somewhat less than interesting to write.

https://bugzilla.gnome.org/show_bug.cgi?id=767765

set_auth_msg() was returning FALSE to indicate error, but all its
callers were expecting a negative return value to indicate error. This
was causing memory leaks for the GError, and errors to not be reported.

Coverity CID: 1325357

The GError should be initialized to NULL, otherwise we'll
"pile up" errors, then try to free an uninitialized pointer.

Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Bug: https://bugzilla.gnome.org/show_bug.cgi?id=699493

https://bugzilla.gnome.org/show_bug.cgi?id=661767

Typo and punctuation fixes, and some rewording, based
on a patch by Philip Withnall, bug
https://bugzilla.gnome.org/review?bug=628193

There's no need to include the exact max length in the error messages,
and it makes it look like the strings need to use ngettext() if you do.

https://bugzilla.gnome.org/show_bug.cgi?id=658206