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/signals.sgml

@@ -180,11 +180,11 @@ filled in by the g_signal_query() function.
 @n_params: 	The number of parameters that user callbacks take.
 @param_types: 	The individual parameter types for user callbacks, note that the
 		effective callback signature is:
-<msgtext><programlisting>
+<programlisting>
 @return_type callback (#gpointer     data1,
                       [#param_types param_names,]
                        #gpointer     data2);
-</programlisting></msgtext>
+</programlisting>
 
 <!-- ##### MACRO G_SIGNAL_TYPE_STATIC_SCOPE ##### -->
 <para>