Version 0.01 - 2021-11-15

  - Finished implementing almost all methods of Tree::RB
  - Renamed option 'compat_list_context' to 'compat_list_get'
    since it only affected the 'get' method.
  - Add tree methods: root, iter, rev_iter
  - Add node methods: tree, left_leaf, right_leaf, strip, as_lol
    min, max, successor, predecessor

Version 0.00_03 - 2021-11-14

  - KEY_TYPE_USTR now uses a correct unicode comparison function.
  - Added option 'compat_array_context'
  - Comparison functions can now be specified by enum constants
  - Added api methods get_all, iter, rev_iter
  - Delete now takes a second optional param to delete a range
  - Renamed exported constants LU_* to GET_*, and added GET_LE_LAST
    and GET_EQ_LAST to handle common cases for duplicate keys.
  - More unit tests
  - Much more documentation

Version 0.00_02 - 2021-11-13

  - Enhanced string-key performance using KEY_TYPE_BSTR and
    KEY_TYPE_USTR.  KEY_TYPE_STR is removed.
  - Various distribution fixes, documentation, etc.

Version 0.00_01 - 2021-11-12

  - Initial release, with partial compatibility to Tree::RB
