Semantics cleanup.

• flipped args to adjust breaking

• of_list now always chooses the rightmost binding

• update, (++), add_seq, to_priority_list

• somewhat faster

v0.1.1 2019-04-06

• Seq.t conversions

• property tests

• fixed key ordering of interval queries

• key order tie-breaks min

v0.1.0 2016-11-20

First release.