Fix markup of Repository Format section
Update Gref_rbranch when connecting
Use setvar for return variables
Use return variables for Goodsig and Signers
Use set -u (no unset vars)
Update license text
Group modifiable globals together
Use append_to
Simplify formatting of the manifest
README: Fix to use `remote id`
Use a function for cleanup at exit
Don't show errors from git fetch when using the git backend
Fix minor coding style and cleanup local variables
Put the main loop for the git protocol in a function