Small improvement in the way the maximum scale of the graph is decided, ...

...to fit better the graph in display area real-estate

 ** OLD**
1 => 1 (max = 10)
5 => 1 (max = 10)
45 => 5 (max = 50)
69 => 10 (max = 100)
99 => 10 (max = 100)
102 => 20 (max = 200)
200 => 20 (max = 200)
456 => 50 (max = 500)
789 => 80 (max = 800)
1002 => 110 (max = 1100)
1450 => 150 (max = 1500)
1900 => 190 (max = 1900)
2400 => 240 (max = 2400)
4094 => 410 (max = 4100)
7000 => 700 (max = 7000)
10001 => 1010 (max = 10100)

 ** NEW**
1 => 1 (max = 10)
5 => 1 (max = 10)
45 => 5 (max = 50)
69 => 10 (max = 100)
99 => 10 (max = 100)
102 => 11 (max = 110)
200 => 21 (max = 210)
456 => 50 (max = 500)
789 => 80 (max = 800)
1002 => 110 (max = 1100)
1450 => 150 (max = 1500)
1900 => 200 (max = 2000)
2400 => 300 (max = 3000)
4094 => 500 (max = 5000)
7000 => 800 (max = 8000)
10001 => 1100 (max = 11000)