bugfix for ooIterPrint.py in Python 2.4

I have been informed of Python 2.4 issue
File
"/usr/lib/python2.4/site-packages/scikits/openopt/Kernel/ooIterPrint.py",
line 6
'isFeasible': lambda p: ('+' if p.rk < p.contol else
'-')
^
SyntaxError: invalid syntax

I have committed workaround for Python 2.4. Still I guess it's better to use Python 2.5, as it is mentioned in OO install webpage.