[PATCH] Fixes sentinel warnings on GCC4

[Sjoerd Langkemper]

This patch fixes warnings like these:
warning: missing sentinel in function call

Look at this page to find at what this warning is about:
http://www.linuxonly.nl/docs/sentinel/

This patch basically replaces NULL with (char *)NULL in functions which 
are NULL-terminated. Maybe it is a good idea to define a constant for 
(char *)NULL, but I don't know where that would be defined.

Sjoerd

Files that this patch modifies:
         src/core-utils/gnc-gconf-utils.c
         src/backend/file/gnc-backend-file.c
         src/backend/file/sixtp-utils.c
         src/backend/postgres/kvp-sql.c
         src/import-export/qif/qif-objects.c
         src/import-export/hbci/gnc-hbci-utils.c
         src/test-core/test-stuff.c
         src/report/report-gnome/gnc-plugin-page-report.c
         src/gnome-utils/dialog-preferences.c
         src/gnome-utils/gnc-recurrence.c
         src/gnome-utils/gnc-tree-view-commodity.c
         src/gnome-utils/gnc-plugin.c
         src/gnome-utils/gnc-plugin-file-history.c
         src/gnome-utils/gnc-tree-model-selection.c
         src/gnome-utils/gnc-tree-view-price.c
         src/gnome-utils/gnc-html.c
         src/gnome-utils/gnc-plugin-menu-additions.c
         src/gnome-utils/gnc-html-graph-gog.c
         src/gnome-utils/gnc-tree-view-account.c
         src/gnome-utils/dialog-account.c
         src/gnome-utils/gnc-tree-view.c
         src/gnome-utils/dialog-transfer.c
         src/gnome-utils/dialog-options.c
         src/gnome/window-reconcile.c
         src/gnome/lot-viewer.c
         src/gnome/gnc-plugin-page-register.c
         src/gnome/gnc-plugin-page-account-tree.c
         src/gnome/druid-merge.c
         src/gnome/dialog-print-check.c
         src/gnome/gnc-plugin-page-budget.c
         src/engine/gnc-filepath-utils.c
         src/engine/TransLog.c
         src/engine/Scrub.c
         src/engine/cap-gains.c
         src/app-utils/gnc-ui-util.c
         lib/goffice/gui-utils/go-combo-text.c
         lib/goffice/gui-utils/go-action-combo-color.c
         lib/goffice/gui-utils/go-action-combo-text.c
         lib/goffice/gui-utils/go-action-combo-stack.c
         lib/goffice/gui-utils/go-gui-utils.c
         lib/goffice/split/gui-util.c
         lib/goffice/split/gutils.c
         lib/goffice/split/plugin-loader-module.c
         lib/goffice/split/plugin-service.c
         lib/goffice/split/formats.c
         lib/goffice/split/plugin.c
         lib/goffice/split/gnumeric-gconf.c
         lib/goffice/drawing/god-drawing-renderer-gdk.c
         lib/goffice/utils/go-file.c
         lib/goffice/graph/gog-plot-engine.c
         lib/goffice/graph/gog-guru.c
         lib/goffice/graph/plugins/plot_barcol/gog-1.5d.c
         lib/goffice/graph/plugins/plot_barcol/gog-barcol-prefs.c
         lib/goffice/graph/plugins/plot_surface/gog-contour-prefs.c
         lib/goffice/graph/plugins/plot_pie/gog-pie-prefs.c
         lib/goffice/graph/plugins/plot_xy/gog-bubble-prefs.c
         lib/goffice/graph/gog-series.c
         lib/goffice/graph/gog-chart.c
         lib/goffice/graph/gog-graph.c
         lib/goffice/graph/gog-error-bar.c
         lib/goffice/graph/gog-style.c
         lib/goffice/graph/gog-object-xml.c
         lib/goffice/graph/gog-axis.c
         lib/goffice/graph/gog-object.c
         lib/glib26/gkeyfile.c
         lib/glib26/gutils26.c

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