Improve Scilab test suite with start/quit scripts + remove useless display.

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/branches/gsoc2009-sploving@12266 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Examples/test-suite/scilab/li_math_runme.sci

@@ -1,6 +1,9 @@
-exec loader.sce;
+exec("swigtest.start", -1);
 
-x = fmod(M_PI_get(), M_1_PI_get())
-
-exit
+try
+   x = fmod(M_PI_get(), M_1_PI_get())
+catch
+    swigtesterror();
+end
 
+exec("swigtest.quit", -1);