Better makefile, restructured, more demos

demo/single.c

@@ -0,0 +1,23 @@
+#include "exclib.h"
+
+/*
+ * What this demo shows:
+ * 1- The general usage of this library
+ * 2- That a basic usage example works
+ */
+
+int main(void)
+{
+  EXCLIB_TRACE("No stack to print?");
+
+  TRY {
+    THROW(3, NULL);
+  } CATCH(3) {
+    EXCLIB_TRACE("Caught 3");
+  } ETRY;
+
+  EXCLIB_TRACE("Exiting program");
+
+  return 0;
+
+}