git: Adjust 'graph' alias and add 'grapha' alias
git: Adjust 'graph' alias and add 'grapha' alias

Drop the `--all` option from `git graph` so that it can be used with any
tree-ish. For example, a branch name, version, tag, or commit.

Create a `grapha` alias for `git graph --all`.

Gastove/dotfiles,codfish/dotfiles,micahwood/linux-dotfiles,necolas/dotfiles,jmyser/dotfiles,pmacom/dotfiles,SBoudrias/dotfiles,pertoyra/dotfiles,bronxct1/dotfiles,senorflor/linux-dotfiles,micahwood/linux-dotfiles,micahwood/linux-dotfiles,senorflor/dotfiles,lgaechter/dotfiles,Stubby/dotfiles,Stubby/dotfiles,marc0uk/dotfiles,sdillingham/dotfiles,saclark/dotfiles,nick-thompson/dotfiles,seiryu9/dotfiles,SiTaggart/dotfiles,seiryu9/dotfiles,codfish/dotfiles,micahwood/linux-dotfiles,intiocean/dotfiles,bronxct1/dotfiles,micahwood/linux-dotfiles