purge TTH database

[greyman 0]

well, client have TTH database for all segments of ever downloaded/uploaded files (or starting to download/upload).

every start it's loading from disk and consumes memory and startup time. need an option to clear this database

from outdated records (not present in share and download queue). for now, i;m just delete HashData.dat,

HashIndex.xml and rehash whole share when client become too bloated with old TTH leaves. it's too long wait

[Crise 26]

use /rebuild

[greyman 0]

thanks :unsure: