review plugins use of expression and change to default-value/component where 
appropriate
----------------------------------------------------------------------------------------

         Key: MNG-830
         URL: http://jira.codehaus.org/browse/MNG-830
     Project: Maven 2
        Type: Improvement
 Reporter: Brett Porter
     Fix For: 2.0-beta-2


we also need a good explanation written down of the difference.

* default-value is used when expression is null
* expression is intended to be used to get the user's override, eg from a 
system property

Perhaps if we could cover that other use case differently (eg by a standard 
system property mechanism that went [plugin-prefix.goal.configuration]), we 
could eliminate expression altogether in a future version of Maven.


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