30273
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11167 Changeset>>#current needs to check for nil
https://pharo.fogbugz.com/f/cases/11167
11165 MethodMapTests: two tests fail due to code change in #halt
https://pharo.fogbugz.com/f/cases/11165
11166 Enable drag and drop on AlainTreeModel
https://pharo.fogbugz.com/f/cases/11166Diff information: http://smalltalkhub.com/mc/Pharo/Pharo30/main/System-Changes-MarcusDenker.219.diff http://smalltalkhub.com/mc/Pharo/Pharo30/main/Spec-Widgets-MarcusDenker.209.diff http://smalltalkhub.com/mc/Pharo/Pharo30/main/OpalCompiler-Tests-MarcusDenker.192.diff
