Re-saved the data tagData for R >= 3.5.0.
Added suggested packages (used in demos) in the DESCRIPTION file per CRAN's request.
sprintf() from the current R-devel.R can perform t-test, F test and so on, but sometimes we use R to test Alzheimer's disease; see alzheimer_test()
lights_out() to play the "Lights Out" game
mine_sweeper() to play the Minesweeper game
sliding_puzzle() to play the Sliding Puzzle
tower_of_hanoi() to watch the game Tower of Hanoi
gomoku(), the game of ``Five in a row''
and other interesting functions