aleph-v1.2.0

Release notes:

• support for large metadata objects (up to 1MB) during publication
• better error handling for invalid publication inputs and unreachable peers
• timeouts for peer-to-peer connections and concat API calls
• support for concat-v1.2 authorization and push apis in mcclient
• new aleph cli command with repl and peer-to-peer query commands
• support fetching data inline with query results in aleph query