fix test-lots and test-period

[Neil Williams]

Log Message:
-----------
fix test-lots and test-period

Tags:
----
gnucash-gnome2-dev

Modified Files:
--------------
    gnucash/src/engine:
        Account.c
        Period.c
        cap-gains.c
    gnucash/src/engine/test-core:
        test-engine-stuff.c
    gnucash/src/engine/test:
        test-lots.c
        test-period.c