DFD: 337 vs. 376, 601 vs. 849

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The AltNextMission (or scenario as I think the tag is actually called) is confusing, because the request deals with reactivating the click map to select from several missions and requires quite a lot new graphics as well as entries in missionmd.ini and mapselmd.ini, but actually has nothing to do with the AltNextScenario which is an override for normal mission selection based on actions within the map. I support the restoration of both features of course.