0.003 2020-05-31 T. R. Wyant
Refactor the get_*_grid() code. This has resulted in signature
changes, though not (I believe) to anything that was in 0.002.
0.002_01 2020-05-15 T. R. Wyant
Add methods get_active_text_grid(), get_used_text_grid(). Add
bookkeeping of live cells in each row and column so the latter runs
in linear time, not quadratic.
Base grid on hash rather than array. This is faster on a large grid
because I do not have to autovivify unused cells. Not surprisingly,
the memory footprint is much smaller.
Tweak change bookkeeping so that only one pass through the changes
list is needed, not two.
0.002 2020-02-21 T. R. Wyant
Increase Perl dependency to 5.8.1 and convert testing to Test2::V0.
Eliminate redirections in POD URL links
0.001 2019-08-31 T. R. Wyant
First production release.