Allow non-standard personal numbers

[Nicklas Nordborg]

The Personal number is usually a swedish ​personnummer. But there are exceptions when a person is not a swedish citizen. See ​http://owaspsweden.blogspot.com/2009/10/dds-programmera-med-personnummer-del-2.html

Reggie should display a warning instead of an error when an "invalid" personal number is encountered. The automatic forwarding to step 2 should not happen. The user must click on the "Next" button to verify that the personal number should be used as is.

[Nicklas Nordborg]

After some more investigations it seems like there are three main types of numbers:

1. ​Personnummer
2. ​Samordningsnummer
3. ​Reservnummer, etc.

So, in the code, the validation procedure goes like this (pnr is short for personal number):

• If the pnr starts with a 8-digit valid date (yyyyMMdd) and the control digit is ok, then it is a 'Personal number'. Automatic registration of date-of-birth and gender is possible.
• If we get a valid date after subtracting 60 from the day-in-month digits, and the control digit is ok, then it is a 'Samordningsnummer'. Automatic registration of date-of-birth and gender is possible.
• Otherwise it may be a 'Reservnummer'. The numbers/letters may not mean anything and automatic registration of date-of-birth and gender is NOT possible.

[Nicklas Nordborg]

(In [1319]) Fixes #300: Allow non-standard personal numbers

This should now handle the 3 cases mentioned in comment 3.