Slight modification of RC-BDE

Replaced share member (RC-BDE) with max to hold max_rc of payer.

share value can still be calculated with use of total cost of transaction and max, but the other way around is only possible to some extent, since value of share was already rounded.

max (when compared to regen in the same block, which is global amount of vests divided by 5 days worth of blocks) can tell if the payer is a whale or a minnow, and f.e. gives opportunity to check average share only within particular user class.

Also accurate value of max is needed to properly calculate average share for a set of operations (although when minnows are mixed with whales the outcome is heavily skewed towards the latter - average calculated out of individual share values can be treated as cheap replacement for median value).