[Pharo-dev] [update 3.0] #30188

[Stéphane Ducasse]

30188
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10745 [ENH]: MethodContext>>#callChainAnySatisfy:
        https://pharo.fogbugz.com/default.asp?10745
        
10838 an MCOrganizationDefinition should only remove empty categories during 
unload
        https://pharo.fogbugz.com/default.asp?10838
        
10853 AlainTreeModel: Want menu on tree items only
        https://pharo.fogbugz.com/default.asp?10853
Diff information:
http://smalltalkhub.com/mc/Pharo/Pharo30/main/Spec-Widgets-StephaneDucasse.193.diff
http://smalltalkhub.com/mc/Pharo/Pharo30/main/Monticello-StephaneDucasse.810.diff
http://smalltalkhub.com/mc/Pharo/Pharo30/main/Kernel-StephaneDucasse.1472.diff