Split and pruned block log improvements
- Reduced TESTNET number of blocks in part file to 400.
- Fixed implementation of --resync-blockchain option.
- Reduced opening of block log part files in read-write mode.
- Added reporting of missing pruned blocks for APIs.
- Secured parallel access to block log parts in case of pruning.
- Added block log auto-splitting feature (described in #686 (closed)).
Edited by Łukasz Bujak