fixed, or marked xfail failing tests
replace indexb and its dependece on leveldb commits
have one commit per block
async batch writes
deactive indexdb
no more commits within trie
profiling for batch imports
add: rlu_cache
Modified the way storage is handled in the block-level cache
naive lru caching broke the tests
Merge pull request #158 from ethereum/db_write_caching

Db write caching