gvariant: Fix confusion between type and format strings in the docs

‘@’ and ‘&’ are only used in format strings, not type strings.

https://bugzilla.gnome.org/show_bug.cgi?id=729269
docs: Fix some minor typos in the GVariant documentation

https://bugzilla.gnome.org/show_bug.cgi?id=729269
[l10n] Update Catalan translation
gio: add a missing property to GDummyTlsConnection

GDummyTlsConnection didn't implement the "interaction" property,
meaning you'd get warnings if you tried to set it while creating a
GTlsConnection when using the dummy backend. (Of course, trying to
create the GTlsConnection will fail anyway, but it ought to fail
without hitting any g_warnings.)
gstrfuncs: Add missing preconditions to g_str_match_string()

https://bugzilla.gnome.org/show_bug.cgi?id=113075
docs: Add a README.rationale documenting major design decisions

It will be useful to document the major decisions which affect the whole
of GLib in one centralised, easily-greppable file, otherwise they will
get lost forever in Bugzilla.

This file should contain a brief explanation of the decision and its
rationale, plus a link to further discussion (e.g. on a mailing list or
bug report).

This contains an initial discussion about use of compiler attributes in
GLib.

https://bugzilla.gnome.org/show_bug.cgi?id=113075
Fix some typos in documentation
gio: iostream: use GTask instead of internal pointer

This fixes an infinite recursion loop when calling
g_io_stream_close_async() on a SoupIOStream.

https://bugzilla.gnome.org/show_bug.cgi?id=722723
goption: Don't include parsed option values in G_OPTION_REMAINING

After a call to g_option_context_set_ignore_unknown_options(context, TRUE),
the values of short options were included in the array returned by a
G_OPTION_REMAINING option.

https://bugzilla.gnome.org/show_bug.cgi?id=729563
Add a testcase for the previous fix

This testcase tests that short option arguments are
not erroneously added to the remaining argument array
when g_option_context_set_ignore_unknown_options is
called.
https://bugzilla.gnome.org/show_bug.cgi?id=729563
Add g_desktop_app_info_get_implementations()

This provides support for the draft addition of 'Implements=' to the Desktop
Entry specification.

https://bugzilla.gnome.org/show_bug.cgi?id=712391
docs: add two missing symbols on GDesktopAppInfo

https://bugzilla.gnome.org/show_bug.cgi?id=712391
tests: add tests for GDesktopAppInfo Implements=

https://bugzilla.gnome.org/show_bug.cgi?id=712391
AppInfo: use XDG_CURRENT_DESKTOP for OnlyShowIn

Expand the functionality of g_desktop_app_info_set_desktop_env() to
include the possibility of passing strings containing ':' characters (as
some apps, such as gnome-session, are directly passing the value of
XDG_CURRENT_DESKTOP).  At the same time, deprecate it, since now we get
the list from the environment variable for ourselves.

Modify the checks in g_desktop_app_info_get_show_in() to deal with
multiple items listed in XDG_CURRENT_DESKTOP.  For example, if we find
that we have

  XDG_CURRENT_DESKTOP=GNOME-Classic:GNOME

and a desktop file contains:

  OnlyShowIn=GNOME

then we will show this file because of the fallback to GNOME.  If the
file _also_ contains the line:

  NotShowIn=GNOME-Classic

Then we will not show it, because GNOME-Classic comes before GNOME in
XDG_CURRENT_DESKTOP.

https://bugzilla.gnome.org/show_bug.cgi?id=729813
tests: add testcase for {Only,Not}ShowIn

https://bugzilla.gnome.org/show_bug.cgi?id=729813
gio: cleanup gdbusmessage.c file

* removed passing GError to ensure_input_padding() function
  - it was necessary before commit 3e5214c15c2a19b64d74e714
  when we used GData*Streams and GMemoryInputStream with
  g_seekable_seek() - now it's useless,

* removed checking return value of ensure_input_padding()
  function - in previous implementation (like above)
  g_seekable_seek() could return FALSE - now it's always TRUE,

* removed passing GError to g_memory_buffer_read_*() functions
  and checking returned value - it also has been inherited after
  old implementation with g_data_input_stream_read_*() functions
  - now it's also useless

* cleaned up code formatting,

https://bugzilla.gnome.org/show_bug.cgi?id=729875
doc: various improvements

- GSubprocessLauncher exists since 2.40, not 2.36
- more logical order for g_markup functions
- fix short description of GMarkup
- GMarkupParser: specify that some parameters are NULL-terminated.
- g_string_new (NULL); is possible.
- other trivial fixes.

https://bugzilla.gnome.org/show_bug.cgi?id=728983
gobject.py: Port to gdb 7.7 frame filter API

https://bugzilla.gnome.org/show_bug.cgi?id=623552
Updated Spanish translation
doc: better ordering of GSubprocessLauncher functions

Take the same order as the header.