New release 2.0.151209

[theoretical]

New release 2.0.151209 at https://github.com/bitshares/bitshares-2/releases

Re-indexing will be required.  Hardfork takes effect at 2015-12-16 at 18:00 UTC.

This release incorporates numerous improvements and fixes.

List of changes
---------------

Market mechanics changes

- Refund order fee on cancellation #445
- Prevent margin call from executing unless feed < call #436

Improvements

- Several API calls added by community members (wackou, Scott Howard) #339
- Add propose_builder_transaction2 RPC

Bugfixes

- Fix referral reward percentages #449 #453 #455
- Improve wallet fee handling #434 #435
- Minor improvements to Javascript integration #439
- Unit testing improvements / bugfixes #413 #437

Cleanup

- Remove unsupported full_web_node and light_client #457

Hardfork #445 changes how we handle the fee paid to create a limit order.  Order objects will now have a deferred_fee field.  For orders created before the hardfork time, fees will be routed as currently and the field will be initialized to 0 to maintain compatibility.  For orders created after the hardfork time, the field will be initialized to the fee.  If the order is cancelled, the fee will be refunded to the order object owner.  If the order is matched, the fee will be routed normally.

Hardfork #436 ensures that you cannot be margin called if the feed says you have sufficient collateral.

This hardfork also retroactively corrects two bugs affecting the referral program.  First, the wallet incorrectly sets the referral percentage, resulting in most accounts referral balances being 1% of
what they should be.  In addition, annual memberships were not being handled correctly.

To ensure that the new code and old code do not split the network, we recommend vesting balance withdrawals should continue to be frozen until the hardfork date passes.