Removed some random unused stuff

[oscargus]

Removed unused variables, methods, and classes that I happened to stumble upon.

[koppor]

Looks OK. The only thing is TextAnalyzer. I think, this could need a more thorough check: It seems that this class can be used to parse plain text references. Would be an offline alternative to the FreeCite parsing. PRRV also seems to do parse text citations. I don't know, what's better, but I would not delete TextAnalyzer without having investigated alternative code. I understand that the current code is used nowhere. However, I would more like to put it into production than deleting it. For instance, the code could help at "Paste entries from plain text" when no internet connection is available.

[oscargus]

OK! I'll figure out how to recover that file. Seemed like a waste to delete it, but since it wasn't used... If you have any feedback on JabRef#25 this is another case where we could throw away fully usable, non-trivial code, which is currently unused (except for a constructor, which in turn is unused).

[koppor]

I think, following steps should do the trick:

1. git rebase -i "HEAD^"
2. in the opened text file, replace pick by edit, save and close
3. git gui
4. select the file in the lower left box
5. choose "Commit" -> "Unstage from Commit"
6. select the file in the top box
7. "Commit" -> "Revert changes", accept
8. close git gui (no commit necessary)
9. git rebase --continue

[oscargus]

Great, that worked! (Except that I my GUI was in Swedish...) Thanks!

[koppor]

Change to English: set environment variable LANG to en. I personally don't like the German translation of git gui.