[Pharo-project] Overrides. Evil. Need to do something with it.

Hello, there is a certain critial places in system, which should not be overridden by external packages. Otherwise, it becomes a mess and usually leads to malfunction in key system parts: compiler, special objects etc. I'd like to propose to introduce a special marker pragma for methods, which should _never_ be overridden by external package. myMethod <doNotOverride> an MC code loader should honor this pragma, and do not attempt to override this method when installing a package or at least ask user that there is a risk of getting serious problems, if you override this method. What you think? -- Best regards, Igor Stasenko AKA sig.