cursor: Deprecated the constructor that takes no Display.

Because gdk_cursor_new() is now deprecated.
Gtk::Grid: Add attach_next_to() without the 'sibling' parameter

* gtk/src/grid.hg: Add an overloaded attach_next_to() without the 'sibling'
parameter. Improve the documentation of attach_next_to(). Bug #739340.
Add Gtk::StyleProperty

* gtk/gtkmm.h: Add styleproperty.h.
* gtk/gtkmm/filelist.am: Add styleproperty.[h|cc].
* gtk/gtkmm/styleproperty[h|cc]: New files. Bug #673317.
Merge branch 'master' of git://git.gnome.org/gtkmm