GA release v1.0.30

Many additions since 1.0.28. The ultimate breakdown is v1.0.28...v1.0.30

Notable:

• Fixed cut-over stall: when cut-over happened to start executing even as lag or otherwise a throttling condition also emerged, a race condition would make the cut-over stall until throttling reason went away. The fix is that cut-over does not wait, and at worst, rolls back.
• fix to cut-over retries -- it didn't throttle properly in between and did not cleanup properly in between.
• cut-over timeout on "unknown" stalls. An example to "unknown" was the throttling problem described above. I don't know what other unknowns there are, but cut-over is now generically resilient to them.
• support for --skip-foreign-key-checks - can save inspection time, when one is certain no FKs actually exist
• Made column-rename detection heuristic more robust (it could wrongly infer a rename by some unfortunate comment or column-name)
• Reading and reporting replication lag before waiting on initial replication event -- this adds visibility in seemingly-hanging operations where the replica is lagging in the first place
• changelog table uses same engine as original table
• on startup, verifying replication works all all the way up to the master.