Small improvements to ./sync-all
- /sync-all get in a local clone does not use local submodules. That is, if I
git clone ghc ghc-tmp; cd ghc-tmp; ./sync-all get
the contained clones come over just fine from ghc/... into ghc-tmp/..., but the submodules are fetched over the network connection. I think the attached patch brings the "fetch from the clone source if possible" behavior over to submodules, though possibly not in an ideal way.
Separately, I find that I want to run shell commands in each repository; adding a "shell" verb is trivial and a second patch is attached.