[glibmm] Add some comments and point to relevant bugs.

[Murray Cumming <murrayc src gnome org>]

commit a57888a58fcb14f4593c3b51792a8845988c40df
Author: Murray Cumming <murrayc murrayc com>
Date:   Mon Aug 5 11:18:36 2013 +0200

    Add some comments and point to relevant bugs.

 gio/src/simpleaction.hg |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/gio/src/simpleaction.hg b/gio/src/simpleaction.hg
index 3746d86..f5dfb93 100644
--- a/gio/src/simpleaction.hg
+++ b/gio/src/simpleaction.hg
@@ -97,6 +97,9 @@ public:
 
   //TODO: Use similar C API if they ever add it. Doing this manually is tedious.
   //TODO: Create a derived SimpleToggleAction class for this?
+  //TODO: Create convenience API that auto-changes the state, like Gtk::TreeView's append_column_editable()?
+  //  See https://bugzilla.gnome.org/show_bug.cgi?id=705133 (it's not documented clearly at all).
+  //TODO: Check whether glib now has API to use enums for this: See 
https://bugzilla.gnome.org/show_bug.cgi?id=705483
   //TODO: Suggest other API that could be used to activate or discover the currently-select radio value.
   /** Creates a new radio action with a string-based target value.
    * 
@@ -108,7 +111,11 @@ public:
 
   //TODO: Use similar C API if they ever add it. Doing this manually is tedious.
   //TODO: Create a derived SimpleToggleAction class for this?
+  //TODO: Create convenience API that auto-changes the state, like Gtk::TreeView's append_column_editable()?
+  //  See https://bugzilla.gnome.org/show_bug.cgi?id=705133 (it's not documented clearly at all).
+  //TODO: Check whether glib now has API to use enums for this: See 
https://bugzilla.gnome.org/show_bug.cgi?id=705483
   //TODO: Suggest other API that could be used to activate or discover the currently-select radio value.
+  //TODO: Check that the need for type="i" in the XML is documented: See 
https://bugzilla.gnome.org/show_bug.cgi?id=704392#c14
   /** Creates a new radio action with an integer-based target value.
    * 
    * @newin{2,38}