"[T]he remedy crafted to address a violation must be tailored to fit that violation. . . . If, by way of modest example, Smith constructs a building on Whiteacre that intrudes slightly onto Jones' Blackacre, the remedy that fits the violation, one would naturally think, would be to require Smith to remove the portion of his building unlawfully situated on Blackacre. It would seem excessive and wrong to require Smith to demolish the entire building, rather than just the offending part of the structure, for such a 'remedy' would partake more of the nature of a sanction or punishment upon Smith for trenching on Blackacre."