Fabian Homborg 49c16cc9a6 Stop migrating old abbrs
This tried migrating old abbreviations *twice* - once from the 2.3
scheme to the 2.4 one, and once from that to the 3.0 scheme.

Since this is purely for upgrading from fishes < 3.0, and basically
untested, let's remove it.

If anyone does that upgrade, they'll simply have to reexecute the abbrs.
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..
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