* remove difficulty field from block_header (derive from total_difficulty)
* address feedback on PR and general cleanup
* rustfmt
* rework pow/difficulty validation in pipe::validate_header
now that we only have total_difficulty available
* cleanup various todos
* rustfmt
* rework DifficultyIterator to track header and prev_header state
* rustfmt caught some garbage syntax
* cleanup
* first explorations at attempting to integrate more user-friendly status screen/ui
* rustfmt
* adding some logo and color for visual interest
* formatting
* better integration with stdout, cleaner looking startup and shutdown
* rustfmt
* update to framework, and first collection of stats from server
* rustfmt
* commit of basic stat screen, think it's in a good enough state to share
* rustfmt
* fix to automated tests
* fix to automated tests
* grin.toml setting
* grin.toml setting
* grin.toml setting
* adding file position index data accessable to the chain, and allowing for storage of such within db
* missing file
* restart files at last recorded position in stored file metadata
* just use tip to store last pmmr index information
* error handling
* test fix