Overview of changes from GLib 2.37.2 to 2.37.3
==============================================

* add a new API for instance private data: G_DEFINE_TYPE_WITH_PRIVATE

* fix timestamps in tarball to prevent automake from being required to
 build the unmodified source

* add new D-Bus API for async property handling

* add back fsync() on ext4 for g_file_set_contents() after it was
 discovered that despite statements in the ext4 documentation
 suggesting that this is safe, it is not safe.

* Translations:
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* Bugs fixed:
698375 - D-Bus async properties
700350 - timestamp issue
701560 - fsync issue (fixed again)
700035 - new API for instance private data