Fix for GAP 4.13

[fingolfin]

Unfortunately this breaks compatibility with older version.
Adjusting this to work in all versions is left as exercise.

[ThomasBreuer]

@fingolfin What about adding the following function

# for compatibility with both GAP 4.13 and older GAP versions
BindGlobal("InstallMethodOrTagBasedMethod", function(oper, requirements, method)
  if IsBoundGlobal("InstallTagBasedMethod") then
    # for GAP 4.13 or newer
    ValueGlobal("InstallTagBasedMethod")(oper, requirements[1], method);
  else
    # for GAP 4.12 or older
    InstallMethod(oper, requirements, method);
  fi;
end);

and calling InstallMethodOrTagBasedMethod instead of InstallMethod for NewVector and NewZeroVector (and also for NewMatrix and NewZeroMatrix)?

Then tst/testall.g runs without errors in GAP 4.12.2.
With the GAP master branch, I get a segmentation fault in tst/testinstall/bsmat.tst.

[fingolfin]

Fine by me. It doesn't matter much as this packages is essentially dead I am afraid :-(