Execution order of child plugins is arbitrary if inheritance is involved
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         Key: MNG-1994
         URL: http://jira.codehaus.org/browse/MNG-1994
     Project: Maven 2
        Type: Bug

  Components: Inheritence and Interpolation  
    Versions: 2.0.1    
    Reporter: John Didion
    Priority: Critical
     Fix For: 2.0.3
 Attachments: mergePluginLists.txt

This is related to MNG-1499, but different, and, in my opinion, equally 
important. It makes sense that the order of plugin execution should be the same 
as it appears in the POM. For example, I have two plugins: one that generates a 
batch file and one that executes it. These plugins must run in order or the 
build will fail. However, the current implementation of 
ModelUtils.mergePluginLists does not respect the order of child plugins.

There is also a seperate bug in that the assembledPlugins map is being checked 
for the presence of child plugins before adding them to the mergedPlugins list, 
but nothing is ever added to assembledPlugins. So if a plugin exists in a 
parent and a child, it will end up appearing twice in the child's plugin list.

I have re-written this method to fix both these problems. See attached.

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