Consider differentiating authors with the same initials using multiple characters from family names

[arnaudgallou]

Currently, initials are made using the first character of each name. Considering two authors named Zip Zap and Zap Zop, the initials will be the same (Z.Z.) in the contribution list.

In such a case, it's recommended to use $get_contributions(literal_names = TRUE) to avoid any confusion.

I could also implement a way to distinguish the initials of authors using multiple characters from family names when the use of literal names is not an option. E.g., Zip Zap and Zap Zop could be initialised as Z.Za. and Z.Zo..