Bug 10767: (follow-up) remove FIXME comments

Bug 10767: (follow-up) remove FIXME comments

The FIXME comments in the new test script were based on
an assumption that GetIssuingRules() should return
multiple rules if no or only partial parameters are
passed.  This is not the intent of that routine, whose
purpose is to return the *singular* rule that best
applies to a given loan situation.  In other words,
GetIssuingRule() is not a traditional accessor function.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>