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Fix from_iso_triplet logic (#257)

from_iso_triplet now works for dates that cross year boundaries.

The updated iso_day_to_date_tuple method now errors with error tuples
for invalid days (< 1 or > 366, depending on leap years) rather than
match errors, so the input to that function needs to be controlled more
tightly. A ordinal date to year and iso_day conversion step was added to
ensure this.

Add test cases around iso_day_to_date_tuple

Add is_leap_year guard macro

Add is_iso_day_of_year guard macro

Change iso_day_to_date_tuple guard clause to use is_iso_day_of_year
instead of is_day_of_year to more correctly bound possible matched input
values. This allows the removal of the first cond in
iso_day_to_date_tuple.

Add error tuples to iso_day_to_date_tuple for days and years which are
invalid.

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