[Spamassassin Wiki] Update of "WritingRules" by SethSeeger

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The following page has been changed by SethSeeger:
http://wiki.apache.org/spamassassin/WritingRules

The comment on the change is:
Added section on Advanced Scoring.

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  valuable mail might get skipped over, but false-negatives are a minor nuisance, so you can
  be a bit more liberal with negative scores.
  
+ === Advanced Scoring ===
+ 
+ Score commands can have 1 or 4 parameters.  If there is only one parameter (the norm) then that score is used all the time.  Example:
+ 
+ {{{
+ score LOCAL_DEMONSTRATION_ALL   0.1
+ }}}
+ 
+ With four parameters:
+ 
+  * The first parameter applies when the Bayesian classifier and network tests are not in use
+  * The second parameter applies when the Bayesian classifier is not in use, but the network tests are
+  * The third parameter applies when the Bayesian classifier is in use, but network tests are not
+  * The fourth parameter applies when the Bayesian classifier and network tests are both in use
+ 
+ Example:
+ {{{
+ score LOCAL_DEMONSTRATION_ALL   0.1 0.3 0.3. 0.1
+ }}}
+ 
  == Advanced rule types (meta, uri, rawbody and friends) ==
  
  In addition to body and header rules, SA supports several other kinds of rules. In general