Merge pull request github#289 from github/concurrent-rowcount-default…

…s-true

concurrent-rowcount defaults 'true'

Merge pull request github#260 from github/hooks-nil-check

safe access to applier/inspector hostnames for hooks

Merge pull request github#231 from github/named-cut-over

Named cut over

Character set recognition and manipulation

- Identifying textual characters sets; converting into specific type when applying dml events
- Refactored `ColumnsList`: introducing `Column` type
- Refactored `unsigned` handling, as part of `Column`
- `Column` type supports `convertArg()`: converting value of argument according to column data type
- DB URI attempts `utf8mb4,utf8,latin1` charsets in that order (first one to be recognized wins)
- Local tests filter by pattern
- Local tests append table schema on failure
- Local tests do not have postpone flag file
- Added character set local tests: `utf8`, `utf8mb4`, `latin1`

Merge pull request github#223 from github/assume-master-host

support for --assume-master-host, master-master/tungsten

Merge pull request github#199 from github/config-underscore

config file allows underscore variables

Merge pull request github#174 from Wattpad/test-on-replica-manual-rep…

…lication-control

outstanding. Thank you!

Merge pull request github#175 from github/apply-dml-tz

setting time_zone on DML apply

Merge pull request github#156 from github/avoid-restarting-replication

accepting `--assume-rbr`, remove `SUPER` requirement

Merge pull request github#143 from EasyPost/issue_142

Thank you