Download skipledger-sql JAR file with all dependencies

SQL implementation of the hash ledger. The hash ledger is a skip ledger annotatated with crumtrails (witness records). It contains only opaque hashes. This module maintains the hash ledger on a relational database. It also models the source ledger (the data being tracked) as 2 SQL queries: one, to determine the number rows in the ledger; the second, to return the ledger row for a given row number.