Log Message: 
Made the granularity of the testpoint intervals be a parameter that
can be set on a global or variablebyvariable basis, so this is now
controlable from the .pg file. For example:
Context("Numeric")>variables>are(
k=>{limits=>[1,10], resolution=>1},
x=>{limits=>[2,2], granularity=>1000},
);
will make k be a variable that will only take on integer values
between 1 and 10, and x a variable that will take on one of 1000
different values evenly spaced between 2 and 2 (so resolution is
4/1000 in this case).
These parameters can also be set for an individual formula:
$f = Formula("k^21");
$f>{resolution} = 1;
$f>{limits} = [0,10];
