[ENH] BlockFullPrintOn-LC ( [er][cd][sm] nice. printString would be nicer.... )

[Lex Spoon]

Looks good to me.  It works fine in my 3.6-based image, though I haven't
tried in a fresh image.

I do wish it used printOn: instead of fullPrintOn:, however, so that
regular inspectors would benefit from it.  Probably most blocks that end
up being inspected, are fairly small, e.g. the block for a sorted
collection.















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