chore, rename ohloh -> openhub
chore, allow ordinal dates in standard reader
minor, reduce date parsing in __strpdt_std() to date-core's __strpd_std()
minor, produce ordinal dates in __guess_dtyp() if need be
minor, support formatting yd dates
fix, PEBKAC, use %D specifier for yd default format string
minor, enable conversion to YD dates in dt_dconv()
minor, support YD dates in all corner routines of date-core (conv, add, diff, cmp)
minor, provide aspects for yd dates to make them fully first-class
minor, accept only 3-digits wide ordinal dates
test, adapt regressions to new first class date type yd
minor, provide getter __yd_get_md()
test, add regressions for back and forth conversion of yd dates
minor, provide conv aspect to yd
minor, fix up yd doys beyond the year count
hygiene, mark overvalued ymcw counts UNLIKELY
hygiene, avoid double-call to __get_ydays() in __guess_dtyp() and signedness violation in comparison
test, adapt regression dconv.041.clit to clamped yd reader
minor, check yd validity upon __ywd_get-yday()
minor, perform checks for out-of-range values in callers of __ywd_get_yday()