minos() ignores tolerance setting

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Set Minuit tolerance to something other than the default.
2. Run Migrad, then Minos.
3.

What is the expected output? What do you see instead?

Because of the nature of the fit I'm running,, neither migrad or minos will 
converge with the default tolerance. Setting Minuit2.tolerance to a larger 
value will let migrad converge. However, minos fails with the error:

VariableMetricBuilder: no improvement in line search
VariableMetricBuilder: iterations finish without convergence.
VariableMetricBuilder: edm = 0.0437396
            requested: edmval = 2.5e-06
MnMinos could not find Lower Value for Parameter  : par = 0

The problem is that the requested edmval in this error message does not change 
when the tolerance is changed. It seems like it should, as I've gotten similar 
errors when running migrad, but in that case the requested edmval can be 
changed by changing the tolerance.

What version of the product are you using? On what operating system?

Most recent version installed on Mac OS X over the Enthought python 
distribution (2.6.4).

Please provide any additional information below.
UP is set to 0.5
Using strategy 2, although changing this doesn't seem to make any difference.
This happens both with and without limits set on the parameters.

Original issue reported on code.google.com by [email protected] on 11 Aug 2010 at 4:33