playing around with leveling incrementing function

added function creates: (might get too difficult to lvl-up too fast...)
"level 1  100 xp  -  100 difference"
"level 2  400 xp  -  300 difference"
"level 3  900 xp  -  500 difference"
"level 4  1600 xp  -  700 difference"
"level 5  2500 xp  -  900 difference"
"level 6  3600 xp  -  1100 difference"
"level 7  4900 xp  -  1300 difference"
"level 8  6400 xp  -  1500 difference"
"level 9  8100 xp  -  1700 difference"
"level 10  10000 xp  -  1900 difference"
"level 11  12100 xp  -  2100 difference"
"level 12  14400 xp  -  2300 difference"
"level 13  16900 xp  -  2500 difference"
"level 14  19600 xp  -  2700 difference"
"level 15  22500 xp  -  2900 difference"
"level 16  25600 xp  -  3100 difference"
"level 17  28900 xp  -  3300 difference"
"level 18  32400 xp  -  3500 difference"
"level 19  36100 xp  -  3700 difference"
"level 20  40000 xp  -  3900 difference"
"level 21  44100 xp  -  4100 difference"
"level 22  48400 xp  -  4300 difference"
"level 23  52900 xp  -  4500 difference"
"level 24  57600 xp  -  4700 difference"
"level 25  62500 xp  -  4900 difference"
"level 26  67600 xp  -  5100 difference"
"level 27  72900 xp  -  5300 difference"
"level 28  78400 xp  -  5500 difference"
"level 29  84100 xp  -  5700 difference"
"level 30  90000 xp  -  5900 difference"
"level 31  96100 xp  -  6100 difference"