v0.1.1.1: create __xwinpp_main
v0.1.2.0: change valid argument <DESK> for command -D
v0.1.2.0: change valid argument <DESK> for command -D
v0.1.2.1: delete fn __xwinpp_win_active
v0.1.2.2: revise fn __xwinpp_set_position_win_active
v0.1.2.3: revise fn __xwinpp_set_position_win_active
v0.1.2.4: update
v0.1.2.4: update
v0.1.2.4: update README.md and doc/