Commit Briefs
get a parser in place for the future inclusion of gotconfig to git repos
this is for got push and got fetch, primarily ok stsp
allow creation of commits which carry unmodified submodule tree entries along
approach suggested by ori@ and matches how git9 behaves ok semarie@ (who can now work with Rust-related Git repos containing submodules)
add submodule tests
ok semarie
changes for 0.36 (tags/0.36)