editor: handle property changes to links. Previously, property changes to links caused 'link ' to be prepended to the link destination. Removing a line that prepended it in Revision::set() appears to fix it. In these cases, the "file marked as link, but contains data" warning might be triggered. This should be safe, so it's lowered to a note and the language made less conclusive. In order to test this, extra revisions are added to the 'symlinks.svndump' fixture. As one of the new revisions add a link that points to 'link to this', a check that asserted that link destinations must not start with 'link ' was removed. This change is safe, as the test later on asserts exact equality with the contents of the 'links' dictionary.

97f2079e3778511944ffb6a662520580650a3993 1.0
09c016174e332eceda015d3f43d96d7e0228acf3 1.0.1
4359ddd73b009fbb356c52ea5d99cba25222ee7a 1.1
8e621dbb82d4363a85317638ad237e2817c56347 1.1.1
093ae2915b452539b44390ee4ea14987484e1eee 1.1.2
708234ad6c97fb52417e0b46a86c8373e25123a5 1.2