Updates chainfile sync and chainfile dump with "write start" and "read start". We now have the option to write/read the start block of the chainfile with the first four bytes. So it's possible that a chainfile has the start index instead of just the count first instead of the number of blocks. This allows for that now.
Description of the Change
Test Plan
Tested manually. Works.
Alternate Designs
None.
Benefits
Proper chainfile sync/dump in N3.
Possible Drawbacks
None.
Applicable Issues
2410
2157