Identify persons by (non-Icelandic) surnames

[vthorsteinsson]

When a person with a non-Icelandic name occurs in a text, let his/her surname on its own refer to the same person as the full name including the surname. E.g., if "Hillary Clinton" occurs in an article, let the surname "Clinton" on its own refer to her. - Additionally, allow dropping of possessive 's' at end of non-Icelandic names if that causes the name to match a previously encountered non-possessive name. ("Clintons" would then match "Clinton".)

[vthorsteinsson]

Partially implemented. Last names are now treated as references to full names, if they have appeared earlier in an article.