Revise ranking algorithm

CHANGELOG.md

install

man/man1/fzf-tmux.1

man/man1/fzf.1

src/README.md

src/algo/algo.go

src/algo/algo_test.go

src/chunklist_test.go

src/constants.go

src/core.go

src/matcher.go

src/options.go

src/pattern.go

src/pattern_test.go

src/result.go

src/result_test.go

src/terminal.go

src/util/slab.go

src/util/util.go

test/test_go.rb