Remove references to nonexisting functions

* glib/gmain.c: Remove references to nonexisting functions
	g_source_set_callback_closure(), g_source_poll(), g_source_add()
	from docs.

	* glib/gdir.c (g_dir_open): Typo fix in docs.

	* glib/gasyncqueue.c (g_async_queue_lock):
	(g_async_queue_unref_and_unlock): Fix markup to avoid erroneous
	<link>s in docs.

	* glib/gwin32.c: Escape #'s leading to erroneous <link>s in docs.

	* glib/gtree.c: Replace some occurances of Gtree by GTree in docs.

	* glib/gstring.c (g_string_insert_unichar): Typo fix in docs.

	* glib/tmpl/conversions.sgml: Add GIConv.

	* glib/tmpl/main.sgml: Fix references to nonexisting functions
	g_main_loop_destroy(), g_source_add(), g_source_connect().

	* glib/glib-sections.txt: Add GIConv, g_str_has_prefix, g_str_has_suffix.

	* glib/tmpl/linked_lists_single.sgml:
	* glib/tmpl/linked_lists_double.sgml: GListAllocator doesn't exist.

	* glib/glib-docs.sgml: Declare hash entity.

	* glib/tmpl/macros.sgml: Escape # in #ifdef to suppress erroneous links.

	* gobject/Makefile.am, gobject/gobject-docs.sgml, gobject/tmpl/*:
	* glib/Makefile.am, glib/glib-docs.sgml, glib/tmpl/*: Produce XML,
	not SGML.

docs/reference/gobject/tmpl/objects.sgml

@@ -440,7 +440,7 @@ without invoking it's destroy() function (if any was
 set).
 Usually, calling this function is only required to update
 user data pointers with a destroy notifier, for example:
-<msgtext><programlisting>
+<programlisting>
 void
 object_add_to_user_list (GObject     *object,
                          const gchar *new_string)
@@ -464,7 +464,7 @@ free_string_list (gpointer data)
     g_free (node->data);
   g_list_free (list);
 }
-</programlisting></msgtext>
+</programlisting>
 Using g_object_get_qdata() in the above example, instead of g_object_steal_qdata()
 would have left the destroy function set, and thus the partial string list would
 have been freed upon g_object_set_qdata_full().