Also re-reported through IRC by Thomas Beck (@plasmasolutions), thanks. Though it's not ideal in theory, we have quite poor handling of object datablock currently from user PoV - before this commit, it was not easily possible to get fully rid of an object anymore if you did not removed it from all its groups before deleting it. So for now, restore 2.76 behavior (namely, unlink an object from avaerything in Blender once it is no more used by any scene). Better handling of all this is TODO for later (also related to much more heavy changes done in id-remap branch regarding sanitizing our ID deletion process).
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