Fix for issue #2, standardized naming on EXCLIB_ scheme; moved EXC_STATUS_LIST to EXCLIB_EXCEPTION; added some new demos and gave old demos more sensible names. Various other small improvements.

demo/catchgroup.c

@@ -0,0 +1,13 @@
+#include "exclib.h"
+
+int main(void)
+{
+  TRY {
+    THROW(2, NULL);
+  } CATCH_GROUP(1) {
+  } CATCH_GROUP(2) {
+  } CATCH_GROUP(3) {
+    EXCLIB_TRACE("Inside of CATCH_GROUP");
+  } ETRY;
+  return 0;
+}