Strategy percentages will differ over time as yield accrued differs in ReservePool

Description

The ReservePool always deposits and withdraws according to the specified strategy weights. As the strategies have different yield rates, the actual weights will change over time.

Recommendation

To overcome this, a rebalance function could be added to the ReservePool that is called whenever the values differ too much or on every rebalance.

Status

This issue has been addressed by adding a rebalance function in commit: #6e95d2a.