add database call to fetch all burn records
adding ablity to fetch all burn records for an account
Merge branch 'develop' of github.com:BitShares/bitshares_toolkit into develop
Disable removal caching in cached_level_map for now
Merge branch 'develop' of github.com:BitShares/bitshares_toolkit into develop
Revert "Disable removal caching in cached_level_map for now"

This reverts commit ad7aa73c9df06d3e06cf980fec77cf226d964c45.
Put mail proof-of-work onto its own thread
Merge branch 'develop' into btsx
Fix withdraw::evaluate hardfork handling