Change in withdrawal timings

Our users complained that their wallets are flooded with our withdrawals that are often too small to be spent without a fee. As a temporary measure to reduce this problem we increased time intervals between withdrawals:

1. Minimal interval between withdrawals of 0.01 btc and more is set to 1 hour (was 10 minutes).
2. Minimal interval between withdrawals below 0.01 btc is set to 1 week of inactivity (was 1 day of inactivity).