Check simargs before adding -c so -gui can work for modelsim.  Fix for issue #23.
Check simargs before adding -c so -gui can work for modelsim.  Fix for issue #23.
svunit/svunit,nosnhojn/svunit-code,nosnhojn/svunit-code,nosnhojn/svunit-code,svunit/svunit,svunit/svunit