The tskit prelude

The contents of the crate prelude are:

//! Export commonly-use types and traits

pub use crate::DoubleEndedStreamingIterator;
pub use crate::StreamingIterator;
pub use {
    crate::EdgeId, crate::IndividualId, crate::Location, crate::MigrationId, crate::MutationId,
    crate::NodeId, crate::PopulationId, crate::Position, crate::RawFlags, crate::SiteId,
    crate::SizeType, crate::Time,
};