Going over initial parts of the scripting overview.

I made a light pass over the text. Switched the includes over to the
new btest-include and adapted the other TEXT-EXECs a bit.

Also includes more tweaking all over the Sphinx setup.

doc/scripting/framework_logging_factorial_03.bro

@@ -0,0 +1,45 @@
+module Factor;
+
+export {
+    redef enum Log::ID += { LOG };
+
+    type Info: record {
+        num:           count &log;
+        factorial_num: count &log;
+        };
+    }
+
+function factorial(n: count): count
+    {
+    if ( n == 0 )
+        return 1;
+    
+    else
+        return (n * factorial(n - 1));
+    }
+
+event bro_done()
+    {
+    local numbers: vector of count = vector(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);    
+    for ( n in numbers )
+        Log::write( Factor::LOG, [$num=numbers[n],
+                                  $factorial_num=factorial(numbers[n])]);
+    }
+
+function mod5(id: Log::ID, path: string, rec: Factor::Info) : string    
+    {
+    if ( rec$factorial_num % 5 == 0 )
+        return "factor-mod5";
+    
+    else
+        return "factor-non5";
+    }
+
+event bro_init()
+    {
+    Log::create_stream(LOG, [$columns=Info]);
+    
+    local filter: Log::Filter = [$name="split-mod5s", $path_func=mod5];
+    Log::add_filter(Factor::LOG, filter);
+    Log::remove_filter(Factor::LOG, "default");
+    }