Seeing there's nothing in this thread yet, i thought i'd talk about what abolition is.
In the broad sense, it means the end of animal exploitation, or the movement to achieve that. That is, no more animals raised for food, used in rodeos or for 'medical' experiments, and so on.
In the more narrow sense it refers to Gary Francione's approach of aiming to end exploitation by encouraging others to become vegan - not supporting welfare campaigns or those that don't promote being vegan.
The reason for this is that welfare campaigns actively support exploitation rather than abolish it, and campaigns that don't promote being vegan don't advocate ending exploitation, but typically only seek improvements in specific areas.
Gary's approach also only endorses peaceful action.
While people can call themselves abolitionists in the broad sense and support welfare, the term more strictly applies to people who follow Gary's approach.
There are some people who consider themselves abolitionists but think that violence has its place - something i won't go into here. They also don't support welfare.
In summary, then, the strictest and 'original' meaning of being an abolitionist in terms of animal rights refers to Gary's approach.
People that think violence has its place have drawn the basic idea of not supporting welfare from Gary.
People who call themselves abolitionists but believe in welfare, are right only in the broadest sense. So to avoid confusion, if you believe in welfare, it's clearer not to call yourself an abolitionist.