built-in add -i: implement all commands in the main loop#171

dscho wants to merge 9 commits intogitgitgadget:js/builtin-add-igitgitgadget/git:js/builtin-add-ifrom

dscho:add-i-in-c-all-except-patchdscho/git:add-i-in-c-all-except-patchCopy head branch name to clipboard