Function libpijul::unrecord_no_resize

pub fn unrecord_no_resize(
    repo_dir: &Path, 
    repo_root: &Path, 
    branch_name: &str, 
    selected: &mut Vec<(Hash, Patch)>, 
    increase: u64
) -> Result<()>

Open the repository, and unrecord the patch, without increasing the size. If this fails, the repository file is guaranteed to have been increased by increase bytes.