remove a bunch of stuff from refguide which is already in scripting chapter, also sync some text between the two. Add warning about not running untrusted scripts.

docs/scripting.xml

@@ -13,13 +13,7 @@
     growing and diverse set of scripts distributed with Nmap, or write
     their own to meet custom needs.</para>
 
-    <para>The Nmap project would like to thank
-    Diman Todorov<indexterm><primary>Todorov, Diman</primary></indexterm>
-    for his excellent work building the initial NSE implementation and
-    writing much of this documentation.
-    Stoiko Ivanov<indexterm><primary>Ivanov, Stoiko</primary></indexterm>
-    also contributed greatly.  The tasks we had in mind when
-    creating the system are:</para>    
+    <para>Tasks we had in mind when creating the system include:</para>    
 
     <variablelist>
       <varlistentry>
@@ -428,6 +422,9 @@ The database lists all of the
 scripts in each category. A single script may be in several
 categories.</para>
 
+<para>Malicious scripts are not run in a sandbox and thus could damage your system or invade your privacy.  Never run scripts from third parties unless you trust the authors or have carefully audited the scripts yourself.</para>
+
+
           </listitem>
         </varlistentry>