New test release

This release reduces memory usage and blockchain file size by optimizing storage of the outputs table. While the reduction is somewhat modest, it will be more significant with pruning (the pruned data does not include the outputs table).

Please test, especially if you have a smaller memory configuration. Very small memory configurations won't work with this, but if you have something that has been barely able to run the deemon previously, this should improve your performance quite a bit.

The next step after this is pruning, so if any issues arise here I would like to address them before releasing the pruning support.

Instructions:

1. Copy your blockchain.bin file to another location as a backup. This version will convert the blockchain file to a new format and you won't able to downgrade to the released code with the upgraded blockchain file.

2.
3. Start node. You should get a message at startup about the blockchain being converted. You can ignore any debug messages about empty outputs and such.

4. Exit node to save the converted blockchain

5. Start node again with new blockchain

Report any issues (or even if no issues)

Thanks for testing!