Merge branch 'jl/fetch-submodule-recursive'

Merge branch 'jl/fetch-submodule-recursive'

* jl/fetch-submodule-recursive:
  fetch_populated_submodules(): document dynamic allocation
  Submodules: Add the "fetchRecurseSubmodules" config option
  Add the 'fetch.recurseSubmodules' config setting
  fetch/pull: Add the --recurse-submodules option

Conflicts:
	builtin/fetch.c