:Git and :Ggrep were defined with the -bar flag, which enables chaining
(`:Ggrep foo | copen`) but also comments (`:Ggrep foo " find foo). The
former is useful but the latter prevents one from using double quotes
with commands. Instead, let's disable -bar and fake it in the
implementation.
:Git implements chaining in a way that's hopefully the same as the way
Vim itself chains. :Ggrep is a little different; it only chains after a
quote or a space so that `:Ggrep -e 'foo|bar'|copen` works as one would
expect.
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