CHANGES:

• breaking: delete containers-thread (which was deprecated)

• breaking: pp: modify Ext.t so it takes surrounding value

• CCMultiMap: Rename functions find_left and find_right in the bidirectional multimap to find_left_iter and find_right_iter respectively to reflect their usage, and add new functions to replace the old find_left and find_right that return a list of values rather than an iterator, to make the signatures of CCMultiMap.S and CCMultiMap.BIDIR cohere. Additionally, change the return type of S.find_iter from t -> key -> (value -> unit) -> unit to t -> key -> value iter.

• CCList: add unfold

• CCBool: Add functions if_then and if_then_else

• CCList: remove some functions that are subsumed by the stdlib

• CCList: use TRMC for many functions on 5.1

• feat CCFunvec: add fold_rev

• add Containers_pp.newline_or_spaces

• cleanup: remove stubs for code always present on 4.08, rely on newer functions in 5.1

• remove last refs to CCShims

• perf: accelerate List.append and List.flat_map on 5.1

• more warnings, more tests, cleanup dead code

• change COC to ocaml-coc