run-tests and unicode

I was having some problems testing in native mode when my ini file had unicode enabled. It appears that it must be explicitly disabled in the script with the passing -N flag (make ntest). Otherwise it is picking up the ini setting and running the tests in unicode mode. Patch is attached just in case I am missing something here about how ntest is supposed to work. This also changes the use of single quotes to double quotes in a couple calls so the script is processed correctly under windows. Dont think this change will affect any systems, but it is needed to allow unicode testing on windows once enabled. Rob