doc: fix := description typo.
doc:  rename "Equals" to "Equal"
Prevent integer overflow with --progress >= 2148

If --progress=2148 or higher was given, the calculation of the next time
to report overflowed, and pgbench would print a progress report very
frequently.

Kingter Wang
Override log_min_error_statement per sqlstate.

Allow the default log_min_error_statement to be overridden per sqlstate to
make it possible to not log statements causing some error types while
maintaining a low log_min_error_statement or enable statement logging for
some error types when the default is to not log any statements.