remove priming from interface

[robby-d]

it's no longer necessary because we can chain unspent transactions (we looked into this, the reliability isn't 100%, but it's "good enough", given that worst case if the transaction won't go through)... priming is pretty wide spread in the interface:

• the priming panel itself (and the display for it on each address bar can go away)
• the auto priming logic can be removed
• maybe some other hidden places

then it will need to be tested (e.g. have an address with only 1 available output, then do a bunch of transactions in a single block and see if they all successfully go through)

[adamkrellenstein]

Until this is done, the minimum fee should be raised to .0002 BTC, because of all of the prime outputs, which are increasing the size of transactions.

[ouziel-slama]

Done. I deal with this issue as a priority.