cal: Add column mode

cal: Add column mode

Add`-v` `--vertical` option to get a vertical output
Add it into relative bash-completion

For example `cal -yv`

                             2020

    January            February           March
Su     5 12 19 26         2  9 16 23      1  8 15 22 29
Mo     6 13 20 27         3 10 17 24      2  9 16 23 30
Tu     7 14 21 28         4 11 18 25      3 10 17 24 31
We  1  8 15 22 29         5 12 19 26      4 11 18 25
Th  2  9 16 23 30         6 13 20 27      5 12 19 26
Fr  3 10 17 24 31         7 14 21 28      6 13 20 27
Sa  4 11 18 25         1  8 15 22 29      7 14 21 28

    April              May                June
Su     5 12 19 26         3 10 17 24 31      7 14 21 28
Mo     6 13 20 27         4 11 18 25      1  8 15 22 29
Tu     7 14 21 28         5 12 19 26      2  9 16 23 30
We  1  8 15 22 29         6 13 20 27      3 10 17 24
Th  2  9 16 23 30         7 14 21 28      4 11 18 25
Fr  3 10 17 24         1  8 15 22 29      5 12 19 26
Sa  4 11 18 25         2  9 16 23 30      6 13 20 27

    July               August             September
Su     5 12 19 26         2  9 16 23 30      6 13 20 27
Mo     6 13 20 27         3 10 17 24 31      7 14 21 28
Tu     7 14 21 28         4 11 18 25      1  8 15 22 29
We  1  8 15 22 29         5 12 19 26      2  9 16 23 30
Th  2  9 16 23 30         6 13 20 27      3 10 17 24
Fr  3 10 17 24 31         7 14 21 28      4 11 18 25
Sa  4 11 18 25         1  8 15 22 29      5 12 19 26

    October            November           December
Su     4 11 18 25      1  8 15 22 29         6 13 20 27
Mo     5 12 19 26      2  9 16 23 30         7 14 21 28
Tu     6 13 20 27      3 10 17 24         1  8 15 22 29
We     7 14 21 28      4 11 18 25         2  9 16 23 30
Th  1  8 15 22 29      5 12 19 26         3 10 17 24 31
Fr  2  9 16 23 30      6 13 20 27         4 11 18 25
Sa  3 10 17 24 31      7 14 21 28         5 12 19 26