Back from vacation, with a message backlog of 181. I'm concentrating first on low-hanging fruit of easily implemented todos, and well reproducible bugs, to get started again. Implemented --batch mode for `git annex get` and `git annex drop`, and also enabled --json for those. Investigated git-annex startup time; see <http://git-annex.branchable.com/todo/could_standalone___39__fixed__39___git-annex_binaries_be_prelinked__63__/>. Turns out that cabal has a bug that causes many thousands of unnecessary syscalls when linking in the shared libraries. Working around it halved git-annex's startup time. Fixed a bug that caused `git annex testremote` to crash when testing a freshly made external special remote.