commands.bookmarks: hold wlock for write operations Any invocations of bookmarks other than a plain 'hg bookmarks' will likely cause a write to the bookmark store. These should be guarded by the wlock. The repo._bookmarks read should be similarly guarded by the wlock if we're going to be subsequently writing to it.

commands.bookmarks: separate out 'no bookmarks set' status messages Upcoming patches will acquire the wlock for write operations, such as make inactive, but not read-only ones, such as list bookmarks. Separate out the status messages so that the code paths can be separated.

tests: test-convert-cvs-synthetic.t requires cvs 1.12 9589227657bc introduced hghave cvs112 10 months ago. Let's assume it has stabilized so much that we can start using it now.