v0.1.0.13: save old $LC_ALL
v0.1.0.13: update README.md
v0.1.0.14: revise __blscd_build_array_initial()
v0.1.0.14: update README.md
v0.1.0.15: revise __blscd_mark_screen_lines_all()
v0.1.0.15: update README.md
v0.1.0.16: change color of marked lines and give indentation
v0.1.0.16: update README.md
v0.1.0.17: delete last line of the screen after ^L
v0.1.0.17: update README.md
v0.1.0.17: delete last line of the screen after ^L
v0.1.0.17: change description