Make hyperlinks in reports result in the appropriate window, not a

[Joshua Sled]

Log Message:
-----------
Make hyperlinks in reports result in the appropriate window, not a crash.

Tags:
----
gnucash-gnome2-dev

Modified Files:
--------------
    gnucash:
        ChangeLog
    gnucash/src/engine:
        qofbook.c
        qofbook.h
    gnucash/src/gnome:
        top-level.c