Tim, thanks for adding me as owner. I'm using TortoiseSVN on Windows. I've only used it to download things before. I have followed the instructions to create a SVN repository on my hard disc, checked out your code, which all works as I expected. I added a directory and the R script and tried to commit it. I get

Command: Commit
Error: Commit failed (details follow):
Error: Server sent unexpected return value (405 Method Not Allowed) in response to
Error: MKACTIVITY request for '/svn/!svn/act/f1309f95-722e-5a48-90bc-a2daf246835c'

I have not yet been asked for a password.