Fix bug in update_active_key
Revert "Prevent multiple RPC requests from executing at the same time."

This reverts commit 86123024494f7b1f410bbe2cbf0569fdf9053757.
Tweak ledger entries, fix bugs on account update
Fix bug preventing UPNP thread from exiting
Tweaks in the mail
Merge branch 'develop' of github.com:BitShares/bitshares_toolkit into develop