jabber.el

I am using prompt history a lot and find it mildly annoying when totally unrelated items show up in the history, when all I really want is items that I previously entered in this very prompt (or a related prompt).

Attached patch adds dedicated history lists for all prompt types:
- account
- presence type
- connection type
- role
- affiliation

I have only tested this patch superficially - I am not using the roles, affiliations, and connection type prompts a lot myself. I recommend to test this yourself before applying it.