Relocate methods from Numeric to Real

[coke]

The following methods are documented as part of the Numeric role but aren't present in the Numeric source (found with xt/check-signatures.t)

    ok 2 - # SKIP Numeric.Int not found on Numeric
    ok 3 - # SKIP Numeric.Rat not found on Numeric
    ok 4 - # SKIP Numeric.Num not found on Numeric
    ok 8 - # SKIP Numeric.conj not found on Numeric

These 4 (there are others not found for Numeric) all appear in Real 's source (which does Numeric), but not in the Real doc page - these method definitions should be moved.

[coke]

Not a simple lift and shift, requires some textual updates as well.