remove borken xaccGUIDType usage.

[Linas Vepstas]

Log Message:
-----------
remove borken xaccGUIDType usage.  The old code probably used to crash
and burn when URL's were clicked.  The new code whould work great.

Modified Files:
--------------
    gnucash/src/business/business-gnome:
        business-urls.c
    gnucash/src/business/business-reports:
        business-reports.scm