变化总结：
更长的解锁时间，更多的资源可以被借出
REX池有四个资源：
-CPU，NET贷款
-RAM交易费
-名称拍卖出价
这些收益将立即按比例分配给REX。
在v1.8.3中，它将从收集到REX阶段的收益开始的12小时内，在30天内线性分配时间。
REX->下限unlent余额->高租金（防止价格过低）
先前版本：
-未借出token不能少于已借出token的20％
-未借出token不能少于总token数的1/6
卖单队列：
-将卖单延迟到卖单队列中，以不触发下限
1.8.3版本：
-未借出token不能少于借记token的10％
-未借出token不能少于总token数的1/5
Change Summary:
More unlent duration, more resources will be lent
There are four resources for the REX Pool:
CPU, NET loans
RAM trading fees
name auction bids（出价）
These proceeds will be distributed pro rata to REX instantly.
In v1.8.3, it will distributed in linear time over 30 days starting within 12 hour from the proceeds collected into the REX staging.
REX -> lower bound unlent balance -> high rental price (to prevent too cheap)
Previous Version:
unlent tokens can't be lower than 20% of lent tokens
unlent tokens can't be lower than 1/6 of total tokens
Sell Queue:
delay the sell order into a sell queue to not violating lower bound
1.8.3 Version:
unlent tokens can't be lower than 10% of lent tokens
unlent tokens can't be lower than 1/5 of total tokens
