Do hilarious case check

If the destination window has left side which on right side of right
side or top side lower side of bottom side, do nothing.

Signed-off-by: SeongJae Park <sj38.park@gmail.com>
Just clean up test code

Signed-off-by: SeongJae Park <sj38.park@gmail.com>
Add verbose option

With verbose option, it shows messages about what's going on inside.

Signed-off-by: SeongJae Park <sj38.park@gmail.com>
Update USAGE on REAME

Signed-off-by: SeongJae Park <sj38.park@gmail.com>
Make options to work correctly.

--menu-height, --system-menu-height, --system-menu-screen options did
not worked by global problem.
Fix it and add test case for them.

Signed-off-by: SeongJae Park <sj38.park@gmail.com>