Give all votes the same weight

Motion:

Starting from Nu protocol V06 all votes will have the same weight, regardless of the amount of shares involved or their age.

Things to change:

• Park rate calculation. Currently the effective park rate is the median of the voted park rates weighted by the share days destroyed. It will be changed to just be the median of the voted park rates.
• Custodian grants. To be elected a custodian must have both 50% of the vote counts and 50% of the share days destroyed. After protocol V06 they will only require 50% of the vote counts.
• Motions. The result of the motions is not actually evaluated by the client because it doesn't have any direct impact. But the RPC command returns the share days destroyed of each motion. It will be removed and only the percentage of blocks will be returned for each voted motion.

Let's include this in 2.0 please.