Add new API call, debug_verify_delegate_votes

The new API call will tally up the votes for a delegate according to the
existing balance records, then compare those with the votes stored for
the delegates in the database. If any discrepancies are found, these are
returned.
Merge branch 'develop' of github.com:BitShares/bitshares_toolkit into develop
fix bugs and improved short price precision
Merge branch 'develop' of github.com:BitShares/bitshares_toolkit into develop
fix abs 32 bit use where 64 bit should have been used
Update submodules
bump genesis
Resolve #612: Parents can now update children's published slates
Merge branch 'develop' of github.com:BitShares/bitshares_toolkit into develop
added ability to support old and new market engine
Merge branch 'develop' of github.com:BitShares/bitshares_toolkit into develop
adding backward compat
Defer connection to seed nodes until network is up

This stabilizes the startup wrt network connections significantly.
Merge branch 'develop' of github.com:BitShares/bitshares_toolkit into develop
Switch to Bitcoin's LevelDB fork for Linux and Mac
Update LevelDB options
Merge branch 'develop' of github.com:BitShares/bitshares_toolkit into develop
Revert "adding backward compat"

This reverts commit b31fc6b6d7c0deb87f49e287f629ef659abbd56a.
Revert "added ability to support old and new market engine"

This reverts commit 7464bea86f3b9c0ddfb5f84bcd626cbe1f6fd85b.
Merge branch 'develop' of github.com:BitShares/bitshares_toolkit into develop