DaxBase#Uses_, DaxBase#Disuses_, Txn_, Proc_ may become unnecessary by allow function.

[sttk]

The proposal of arrow function has been presented here: https://github.com/golang/go/issues/21498.
If this proposal will be accepted, some functions and methods will become unnecessary.

func (base * Daxbase) Uses_(name string, ds DaxSrc) errs.Err {
    return func() errs.Err {
        return base.Uses(name, ds)
    }
}
runner := base.Uses_(name, ds)

　　↓

runner := () => base.Uses(name, ds)