30046
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10313 initialize SpecProxyDebugger to be able to choose it in pre-debug window
https://pharo.fogbugz.com/f/cases/10313
10303 Duplicated instance #model in NewList (already defined in MorphicModel)
https://pharo.fogbugz.com/f/cases/10303/Diff information: http://smalltalkhub.com/#!/~Pharo/Pharo30/diff/NewList-MarcusDenker.26
