let the back detection become more accurate

fixed an bug.
if you are hurt at the moment you finish using pills, the pills will be ineffective.

fix bug

fixed an bug.
if you are hurt at the moment you finish using first aid pack, the first aid pack will be ineffective.

fix some bugs that you will directedly die if you have enough temp health

Expand the scope of the back judgment

back damage detect

fix an important bug.
for example,when you have 34 points of real health,and you absorb 33.5 damages. because 33.5<34,
so the script will decrease your real health,instead of making you incapable(downed). but the 33.5 damage will then round up to 34 damage,
so your left health will be 0 point, and then, instead of being down, you die.
now, if the result of subtracting the damage from your real health is less than one and more than zero, the script will set your real health as 1 points.

修复一个重要的错误。
例如，当你有34点真实生命值，并且你吸收了33.5点伤害。因为33.5<34，
所以脚本会减少你的真实生命值，而不是使你无法行动（倒下）。但是33.5点伤害会向上取整为34点伤害，
所以你的剩余生命值将为0点，然后，你不会倒下，而是死亡。
现在，如果从你的真实生命值中减去伤害的结果小于1并且大于0，脚本会将你的真实生命值设置为1点。

decrease the percent()