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Fixed 12hour handling in pretty-printer

• See issue #79

Added am/pm to format string

Replaced pretty print with pretty-print to be consistent with upstream stdlib Format, and fmt package documentation

Changed error messages to not be capitalized

• See issue #78

Added timedesc-tzlocal.unix-or-utc and made it the default backend

Updated documentation of Time_zone_info

• See issue 72

Replaced local_dt_result with local_date_time_result for consistency

Changed signature of equal_local_date_time_result so the argument for the inner equality check function is no longer labelled