Merge remote-tracking branch 'github/tokkee/sh/check_pgsql'
* github/tokkee/sh/check_pgsql:
check_pgsql: Determine connection time in µs-resolution.
check_pgsql: Leave 'min' value in query perfdata empty.
check_pgsql: Updated copyright.
check_pgsql: Added support for the -o command line option.
check_pgsql: Removed -4/-6 flags from help output.
check_pgsql: Allow UNIX socket directories as hostname as well.
check_pgsql: Use PQconnectdb() rather than PQsetdbLogin().
check_pgsql: Fixed query perfdata output for empty warn/crit ranges.
check_pgsql: Added support for executing queries.
Conflicts:
plugins/check_pgsql.c