Use the new dialog that remembers whether or not it should suppress

[David Hampton]

Log Message:
-----------
Use the new dialog that remembers whether or not it should suppress
further instances.

Tags:
----
gnucash-gnome2-dev

Modified Files:
--------------
    gnucash/src/register/ledger-core:
        split-register-control.c
        split-register-model.c
    gnucash/src/gnome/schemas:
        Makefile.am

Added Files:
-----------
    gnucash/src/gnome/schemas:
        apps_gnucash_warnings.schemas