ZIP 1014: remove redundant credit line and fix potentially bad incentive structure in volatility reserve.
ZIP 1014: remove redundant credit line and fix potentially bad incentive structure in volatility reserve.

Originally https://github.com/zcash/zips/pull/308/commits/71de73058e3645c35a7208ef7a5276d03c3b37a5

Co-Authored-By: Josh Cincinnati <83967ecc7b0b479e3d2be8d460f05bbbb6d57659@users.noreply.github.com>
Signed-off-by: Daira Hopwood <cd7d43d5556a38ce626d53826fddc46adc597539@jacaranda.org>

zcash/zips,zcash/zips,zcash/zips,zcash/zips