This commit converts all block height references to int32 instead of
int64. The current target block production rate is 10 mins per block
which means it will take roughly 40,800 years to reach the maximum
height an int32 affords. Even if the target rate were lowered to one
block per minute, it would still take roughly another 4,080 years to
reach the maximum.
In the mean time, there is no reason to use a larger type which results
in higher memory and disk space usage. However, for now, in order to
avoid having to reserialize a bunch of database information, the heights
are still serialized to the database as 8-byte uint64s.
This is being mainly being done in preparation for further upcoming
infrastructure changes which will use the smaller and more efficient
4-byte serialization in the database as well.
- Delete spent TX in setclearSpentData when unspent by block
disconnect on reorg; return an error when there's more than
one record to delete in the spent TX as that should never
happen.
- Test spent TX deletion when reorg causes block disconnect.
- Test for correct NewestSha results after DropAfterBlockBySha.
- Fix DropAfterBlockBySha to update info for NewestSha.
- Updated copyright statements in modified files
