Parse Stack Exchange Dumps

Some structs to facilitate parsing of StackExchange dumps into easy-to-use values.

```rust use std::fs::File; use std::io::BufReader; use std::path::Path; use quickxml::de::fromreader; use se_dump::post::{PostId, Posts, PostType};

let reader = BufReader::new(File::open(Path::new("sampledata/Posts.xml")).unwrap()); let posts: Posts = fromreader(reader).unwrap(); asserteq!(posts.posts[0].id, PostId(2115)); asserteq!(posts.posts[0].post_type, PostType::Answer); ```

Incomplete

Currently, only Post and PostLink structs are provided22