New info/question/warning dialogs that remember whether or not the user

[David Hampton]

Log Message:
-----------
New info/question/warning dialogs that remember whether or not the
user wants to see them again.

Tags:
----
gnucash-gnome2-dev

Modified Files:
--------------
    gnucash/src:
        gnc-ui.h
    gnucash/src/gnome-utils:
        gnc-gui-query.c

Added Files:
-----------
    gnucash/src/gnome-utils:
        gnc-gui-query.glade