What are these folders for? Can I remove them? How?

In a folder on the SVN server/repository that is designated for our project, there have appeared the following folders:

1. branches/
2. conf/
3. db/
4. hooks/
5. locks/
6. tags/
7. trunk/
8. README.txt (file)
9. format (file)

We have all the code in the trunk folder. There were, as far as I can开发者_如何学Python remember, only 3 or 4 folders earlier.

Within the trunk folder, too, there are now these folders.

1. OurCode/
2. conf/
3. db/
4. hooks/
5. locks/
6. README.txt (file)
7. format (file)

I understand many of these folders or files are not necessary, but I can't be too sure.

My questions are:

1) What are each of these files and/or folders for?

2) Which are the ones that are not necessary?

3) How may I remove them from the server repository?

It seems you mixed up a repository with a working copy. Did anybody accidentally checkout or export (thanks, Rudi) the repository into the folder where svn keeps it data?

(Note that this might be wrong depending on the backend your svn installation uses. I have only ever seen Berkley DB backends.)