collections::bitv: remove some ancient interfaces

Removes the following methods from `Bitv`:

  - `to_vec`: translates a `Bitv` into a bulky `Vec<uint>` of 0's and 1's
    replace with:  `bitv.iter().map(|b| if b {1} else {0}).collect()`

  - `to_bools`: translates a `Bitv` into a `Vec<bool>`
    replace with: `bitv.iter().collect()`

  - `ones`: internal iterator over all 1 bits in a `Bitv`
    replace with: `BitvSet::from_bitv(bitv).iter().advance(fn)`

These methods had specific functionality which can be replicated more
generally by the modern iterator system. (Also `to_vec` was not even
unit tested!)

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