30121 ----- 10600 add environment: and class: compatibility methods to Compiler https://pharo.fogbugz.com/f/cases/10600 10598 MorphTreeNodeMorph draws wrongly drop highlight https://pharo.fogbugz.com/f/cases/10598 10599 AlainTreeModel not fully covered use of isCheckList https://pharo.fogbugz.com/f/cases/10599 Diff information: http://smalltalkhub.com/mc/Pharo/Pharo30/main/Spec-Widgets-MarcusDenker.151.... http://smalltalkhub.com/mc/Pharo/Pharo30/main/Morphic-MarcusDenker.1429.diff http://smalltalkhub.com/mc/Pharo/Pharo30/main/Compiler-MarcusDenker.454.diff