newktmerkle

[sanjit-bhat]

• rename SigSep -> Sep
• rm ver_rpc
• move hashChain to using sep structure
• server sign new link msg
• rpcs now return info for new signed link. put promise also returns signed prev link
• finish cli.put, add link evid
• finish cli.get. prev code wasn't checking merkle proof
• caught bug. when filling, should check if epoch+1 exists
• fixup audit
• finish ktmerkle
• dom sep consts were stale
• make adtr stronger; check chain continuation
• rename selfCheck, trim client struct by passing adtrs directly into audit method
• split cli get into getAt and getNow. preparing for use case where cli only does get at certain epochs that they know the source client has already covered with a selfcheck
• first pass at new test
• update deps
• use new marshal.readbool/writebool
• update rpcs
• pass test
• make linter happy
• pin staticcheck version for better caching