Log Message: 
Updated the answer checkers so that you can more easily specify how
the correct answer shoudl be displayed. In the past, you could use
something like Real(sqrt(2))>cmp(correct_ans=>"sqrt(2)") to do this,
but that is awkward. Now the Compute() function (which parses and
then evaluates a string) sets things up so that the original string
will be what is used as the correct answer. That means
Compute("sqrt(2)")>cmp will have the same result as the example
above.
You can also set the {correct_ans} properly of any Parser object to
have that value used as the correct answer. For example
$x = Real(sqrt(2));
$x>{correct_ans} = "sqrt(2)";
ANS($x>cmp)
would also produce the same answer checker as the two previous
examples. All three methods should work. Use the one that is most
convenient for you.
