Replace code of the form `if cond then return true; else return false; fi;` by `return cond;`

[fingolfin]

[fingolfin]

An extreme case of this is in function IsMinimalNonAbelianGroup:

    function( G )
      if IsAbelian( G ) then
        return false;
      else
        if ForAll( MaximalSubgroups( G ), x -> IsAbelian( x ) ) then
          return true;
        else
          return false;
        fi;
      fi;
    end );

which could be replace by just

    G -> not IsAbelian( G ) and ForAll( MaximalSubgroups( G ), IsAbelian ) );