Regionset improvements

[khoroshevskyi]

Improved regionSet

Changes:

• Added reading of bed file from url
• Added calculation of digest
• Added functions: to_bed, to_bed_gz, to_bigbed

[donaldcampbelljr]

looks good, needs minor cleanup.

[nleroy917]

I agree just run cargo fmt, and then the only real thing I'd wanna discuss further is using Option<String> for the rest param instead of an empty string everywhere.

I think that would be better instead of allocated a bunch of empty strings everywhere, right?

So its:

struct Rust {
  pub chr: String,
  pub start: u32,
  pub end: u32,
  pub rest: Option<String>
}

[donaldcampbelljr]

lgtm

[nleroy917]

I tried to get to it all. The only critical thing is the double import of:

// bindings/python/src/digests/mod.rs
use gtars::digests::{md5, sha512t24u, DigestResult};

Nothing will build or run otherwise. Do you use rust-analyzer and clippy? Both are really good at catching things like this.