Add unspent balance output

[fsvm88]

Hi!
Would you be interested in merging these patches?
They add unspent CSV output dump as a CSV file (balance for all addresses where balance != 0).
Consider that it was my first attempt at writing code in rust and was mostly taken and modelled on the csvdump callback.
It uses a hashmap and preallocates around 10mln entries, which sort of reflects the number of unique unspent addresses at the time I wrote it (August last year).
The module can be useful to avoid having 150GB+ SQL databases just for tracking unspent output.
There's no suspend/resume support (would need to serialize/unserialize the hashmap to disk I guess).

[Napulsnik]

Hello. Which command can get a list of unspent balances? In the help it is not written.

[fsvm88]

Hi @Napulsnik, the command is "unspentcsvdump".
You should use it just like csvdump, it doesn't currently support/make use of the resume option, so it will always run on the entire blockchain.

[Napulsnik]

Thank you!

[Napulsnik]

Need a lot of memory. If you send me fresh list of all bitcoin addresses with balance I pay you 10$ in bitcoin. Deal?

[fsvm88]

@Napulsnik Yup, it does need a lot of memory. Thanks for the offer, but I'd need to download and sync the entire blockchain and then run the whole thing. Don't have that much spare time atm. :)

[Napulsnik]

Ok.

[gcarq]

I will update the README to reflect that change.

[edenweb1]

@Napulsnik , I have a fresh csv list (all btc adress with positive balance - august 2017)
if you are interested !

[Napulsnik]

No longer needed