strict date recognition using locale's separator and ISO 8601

- Removed separators '-', '.' and '/' working in all combinations in all
  locales forcing a date even for 23/12.99 (if locale has DMY order)
* Only the locale's date separator is accepted, plus '-' if the input may
  represent an ISO 8601 date yyyy-mm-dd, check is lax though on minimum
  digits, y-m-d is also accepted.
* Additionally, accept yy-month-dd or dd-month-yy with month name. Year must
  be <1 or >31, 2-digit year magic for values 0,32..99 is applied, or has to
  be prefixed with leading zero.

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